SELLERS:

Feedback:

1. A seller can only leave postive for the buyer or nothing at all.  For a seller with a problem buyer this is like be set in the middle of the ocean and told to swim back - if you make it fine and if you don't there'll be another seller to take your place shortly.  You ca leave postive feedback or recive feedback for up to 60 days after the end of the auction.
2. When a seller files a non paying bidder and the bidder just files a negative on your feedback without answering the complaint Ebay will remove the negative or the neutral feeback and give the buyer a strike.
3. Neutral and negative feedback affect the sellers score equally.  My 3 neutrals added to my one negative brought me down from 99.7% to 98.1%.  Just hope buyers can read through the complaints to get at the real truth.  Scores were based on a 12 month (1 year) bases.  Negative and neutral feedback by suspended buyers has not yet been removed - though Ebay promises that it will eventually do so.  http://pages.ebay.com/help/feedback/feedback-scores.html They say that netural feedback leaves the score the same like before - but this is not true.  I dropped from 99.7 to 98.1 with my 3 neturals taking most of the credit.
4. All feedback counts toward your final score - the catch is that only one feedback per week can be left by the same buyer.  But for the time being they will count all the way back to 1996 - if you've been on that long.
5. If a buyer tries to force postive feedback from you or trying to scam you - called extortion - report them to Ebay immediately and let's get this bad seed off on Ebay
6. Sellers who were or are Power Sellers but who are in danger of loosing their status due to the new feedback changes will have 60 days from May 20th, 2008 to correct their situation.  This means that if you are below 98% you have a problem that needs fixing immediately.  If you do get your Power Seller status back up than each 30 day period you must be at 98% or above or out you go.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-22155259
7. Reply to negative feedback left on your feedback page.  Get in there and state your case.  Don't get emotional or call them names - just state your case.  My negative is from a buyer that couldn't read in the title and description that the pattern only had 1 piece.  So when I replied to the feedback I just copied and pasted the line from the description that said it only had one piece.   If your buyer claims you are a slow ship - just give the tracking number and where you shipped & the date they paid.  With the tracking number anyone can research it and find out where the hold up was and why the package was so slow to get to the buyer.
8. Sellers have always been empowered with the block the bad buyer program.  This may be more important than ever to use now.  If you had a bad experience once, you don't want a repeat performance.  So block them, it doesn't hurt them but may say you a ton of trouble down the road.  If a buyer you block, opens a new account and wins your item and leaves you a negative - Ebay will remove the negative and sanction the buyer.   A seller can even block a buyer who has been a problem to ther sellers, I beleive this is called prevention.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-07090115
9. Mutual feedback is still available for the buyer and seller for a while, but Ebay plans on removing this later this year.  But, my question is why would the Buyer care anymore since you can't leave them a negative anyway - you are no threat to them.  So don't waste your breath asking.  Unless of course, you've worked the impossible out with your buyer and they are now in a friendlies mood, they may well regret their rash decisions and help you out by getting the negative or neutral removed.

Miscellaneous

1. There are no more merging accounts - this used to be when you had 2 or more ID's you could merge them into one account while maintaing your feedback rating for all.  This one is gone and I for one am glad. 
2. Sellers can not leave multiple choices in an auction regarding color or size or configurations, which was banned before.  But items must be the same and not different.  For instance offering a pair of Barbe shoes in blue or green.  Still a no no would be a computer or a cell phone.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-19130839
3. Sellers who offer thesame thing multiple times, rather than do a dutch auction.  Will now be limited to up to 10 of the same  thing and only one of those auctions will show up per page.  The exception to  this rule is if you are the only one selling the item.  Link policy begins in July 2008.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-19130839
4. In June 2008 anything that uses keyword spamming, a misleading title, putting an item in a wrong category,  search and brows manipulation or using a brand name in a inappropriate manner will be combined into one big NO NO group with severe penalties.
5. Mystery auctions will be a thing of the past in June 2008.  Raffles, give a ways, and random drawings are already prohibited.  http://pages.ebay.com/help/policies/listing-bonus-prize-giveaway-raffle.html
6. Sellers Dashboard has been improved to help improve the sellers experience.
7. The better your DSR ratting the better exposure you will have.  You have the possible 5 - which is the walking on water stance that will get you the post exposure.  Or you can have mine - which is - item as described, communication are 4.7.  Shipping time is 4.5, shipping and handiing charges is 4.6 (most of my auctions ship free - but guess people aren't in to free).  Anyway this averages out so I get high exposure but not walk on water and not fall down the stairs exposure either.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-19130839
8. If you have less than a overall 4.5 rating (those little stars at the side right on your feedback page totaling this) you are in the target range for withholding monies from buyers.  If you maintain a 4.6 than you are about a 95% rating and gain above average exposure.  Sellers with low ratings in shipping and handling and general customer satisfaction will receive less to very little exposure.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-23094928
9. If you choose the title for your product in a way that benefits the buyer  you will be put in the best match category along with others.  If your title matches the closet to what the buyer wants the closer to the top your item will be.  There are other things that the buyers want they may be considered into a Best Match but the title goes a long ways.
10. Sellers who sell other than Ebay can no longer put a link into their auction to direct customers to their sight for check outs, etc.  Not can they put it in their About Me page.  Even if the link is one owned by Ebay!  Links to additional instuctions wil also be prohibited.  EXCEPTION will be third party links for photos or Actuvia.   http://pages.ebay.com/sell/May2008Update/FAQ/http://pages.ebay.com/help/feedback/about_me.html
11. Power Seller program eleigibility will be deterinded in the same way as the feedback program currently is!  http://www2.ebay.com/aw/core/200805.shtml#2008-05-07090115

PAY PAL

1. Can withhold payments to seller, till after item is shipped and buyer leaves postive feedback.  My question has always been - what if you can prove shipping item and buyer doesn't leave feedback who gets the money then?  Me, myself and I will cancel any auction that Pay Pal withholds my payment on and if they do it to much I will stop using Pay Pal and pay more and go to another site for better services for my needs - not the buyers.  Thank goodness that has not occured yet! 
2. All oversee packages must be insured and this includes shipping to Canada, Mexico and the rest of the contingent other than the US.  If you are not insured and the buyer complains - even with proof of mailing - Pay Pal will refund the buyers money.  For this reason I quit mailing 1st class which is mailing without insurance.
3. It's been long used policy that Pay Pal cannot be used to purchase anything under the Ebay category of mature audience, but they are not cracking down on it, so that billing your client through the system but not listing the email is more frowned on than before.  Penalties?  Who knows.  http://pages.ebay.com/help/policies/mature-audiences.html
4. Is giveing some buyer 90 days to pay for the purchases they make on Ebay.  Not to worry the seller gets paid right a way.  http://www2.ebay.com/aw/core/200805.shtml#2008-05-15112725