Since there are no individual reviews available for motion sensor wildlife cameras, I thought I would give a synopsis of the cameras that I have been using and my best impressions of the rest.

There are a lot of different cameras available, and this is not a complete guide to each and every one of them, but it should help you find at least one good option for your needs.  This guide focuses on the situations where each brand shines.

First, there are two things that NO camera that I have tried can do:  1. They cannot monitor more than about 50 feet - no watching elk herds in a meadow.  2. They are never undetectable - even infrared cameras get noticed by wildlife, but most animals will tolerate any camera without altering thier patterns.

Before I get into brands, I would like to address the concept of the flash.  The decision between white flash or Infrared flash (also known as flash vs. IR)  has virtually nothing to do with brand (except that some brands may only offer one option and some brands handle IR better than others).  IR is seriously overrated when it comes to preventing spooking wildlife, and the actual reasons that you should consider IR is theft and video.  Despite the hype, an IR flash is visible to most animals (even humans) within the trigger range, but it won't be visible to anything that is not in the photo and it is benign enough that most people will think they just caught a strange reflection in thier headlamp, while a white flash is a giveaway that there is a valuable camera in the area.  I have taken thousands of photos with both IR and white flash, and animals (especially elk) always flinch the first time the get thier photo taken with supplemental light.  After the first photo 80% of the animals simply ignor the flash (especially mule deer and antelope) and about 19% of the animals will come up and smell the camera before ignoring it.  A couple bulls in high pressure units ran away from both IR and white flash.  White flash is better for photos and white flash cameras have several advantages.  They are cheaper.  They can take color photos at night.  They usually have about 50% more range.  And, in most cases, IR cameras have to activate a filter which delays the photo and sometimes makes enough noise to spook game much more than a white flash would have.  If my cameras are either secure or remote, I prefer white flash.  If I'm trying to catch tresspassers, I use IR.  Now, even though I've just made a strong case for white flash, when I go to video I always use IR.  IR images (they're actually black and white) take up far less space on the memory cards than color, so white flash cameras can fill up your memory overnight if they are on video mode (that is assuming they can take nighttime video). 

Here are the major brands, including how familiar I am with them (in no particular order):

Cuddeback, my buddy owns a couple:  These cameras are pretty much mid-range in every aspect.  They don't really excel at anything, but would be a good choice for the variety hunter that might use them for a month on turkeys in the spring, elk in September, mulies in october, and whitetail in November.  They are probably the most difficult to program, and if you don't use them year round you will probably have to find the manual every autumn.  I hate to program them so bad that I have my buddy set them up for me and I put duct tape over the sensor until they are in the field.  They do have a security code, but a thief probably won't know that until he gets it home and tries to use it.

Moultrie, owned by me:  The battery life champion.  With D-cell batteries and low-drain monitoring modes you will be able to fill a 4GB card without running out of juice.  They could monitor a water hole from June to October on a medium resolution setting and a 4GB card - if that isn't long enough they offer an optional solar panel.  They are made for a specific purpose (watching Moultrie brand feeders), and will frustrate users who don't keep that in mind.  They take a couple seconds to wake up and take the first photo.  They are great for water and baits (where legal), but they are slow and you will get a lot of empty photos if you try use them to monitor a trail.  The IR versions click a lens in place that will startle wary trophy animals.  However, even trophy animals are tolerant if they feel secure in the area or if the camera has been there a while.  Video mode performs much better than still-photo mode.  A big bonus is the addition of temperature and moon phase in addition to the label and time stamp.

Wildview, owned by me:  Cheap.  When I want white flash, but am a little worried the cameras will be found, I put up the Wildview.  They are decent cameras with no frills.  Programming is limited, but that means it is also so simple my grandpa could probably set them out for me.  A set of batteries can barely fill a 2GB card, but if you are looking for economy they are a decent option.

StealthCam, not very familiar:  Covers the complete range of possibilities.  StealthCam offers the widest variety of cameras.  Some of them are nearly as cheap and simple as Wildview, most are comparable to Cuddeback, but a few rival the top brands. 

Recon, recently purchased by a coworker:  It seems that Recon's focus is to remain undetected.  So far I have not been impressed.  Quality seems good, but it doesn't wake up fast enough to beat out cameras that cost 1/2 as much when comparing trigger speed.  If you're watching trails, trigger speed is critical.

Predator, not very familiar:  The nighttime specialist.  Predator is focused on producing the best nighttime photos.  This sounds great at first, but since you can't hunt at night, it is only aggravating to know that a monster buck comes in at 1AM, but he could be anywhere from zero to twenty miles away during shooting hours. 

Reconyx, owned by me:  The sniper.  If you're after tresspassers or the most wary animals, Reconyx cameras take about 1/5th of a second to wake up and snap the first photo and you can set them to keep taking photos so fast that you won't even miss the absence of a video mode.  If you get a lot of empty photos with your trailcam, it is because you aren't using Reconyx.  The photos are also consistently good quality, and I have found that a 3.1megapixel Reconyx rivals a 5+megapixel resolution camera made by any competitor.  The sensor can be adjusted and I have been able to get it to reliably trigger at over 100' during the day, but at night it is limited to about 30' (comparable to all but Predator at night).  They also put a temperature and moon phase stamp on the photos.  They are expensive.

Penns Woods, owned by buddy:  The best photos and the most expensive camera.  It is also the easiest to use.  The photos are taken on a seperate digital camera that you can take out and use for everyday photography.  The IR on these cameras is different than most, and it is the least detectable of all the cameras I've seen.  At first, we were frustrated with battery life (it takes AA's), but we have found that lithium batteries make the battery life comparable to all C-cell and some D-cell cameras - if you have enough spare cash to go with Penns Woods, you should be able to afford lithium batteries.  They are also a little slow waking up for that first photo and there is some motor noise that tends to scare game as much as a flash would.  They just released a cell phone version that will instantly send your photos to an email box, which would make it virtually impossible for someone to steal without getting caught.  The cell camera is roughly the same price as regular, but you'll have to have add a Palm Treo and a cellular account (though it works with any provider that will send photo messages).  I have several places that I would like to use the cellular camera, now I just need someone to send me one.

LeafRiver, I'm detered by bad photo color:  Every photo I have ever seen taken by a LeafRiver camera has poor color.  The upside of these cameras is that they have built-in LCD screens so you can see the photos right on the camera (for me this isn't useful because I view photos in the field on my Palm handheld computer).  I've also heard that these cameras can have problems with certain memory cards.

Bushnell, maybe a reasonable cheap option.  Whether it is binoculars or cameras, Bushnell offers a variety of products for the economically minded sportsman.  The low end cameras are rarely triggered by anything further out than 25 feet.  The higher end cameras are a little more sensitive, but respond even more slowly than Moultrie - in other words, be ready for lots of empty photos.  I would only buy one to use in dense woods where I could put it within 20' of water or bait.  In short, the names "trailscout" and "trailsentry" are complete misnomers because most animals on a trail will walk past the lens before the camera shoots.

I welcome comments and if you think that one of my generalized brand descriptions is not accurate, please let me know about your experience and I will consider incorporating your information. 

I would like to mention that I am trying to move up the reviewer ranks.  Only one out of 75 of my review readers actually takes the time to click the button (Ebay shows me the # of times it has been viewed).  If everyone that reads this guide for just 2 weeks clicked on the helpful button, I would move up several hundred points.