As of October 2009, Google is no longer accepting individual feeds.  Sorry folks!  You will have to hope eBay finds a way to feed items to Google on your behalf.  Without the Item Condition attribute in many categories, the likelihood of this happening is slim at this time.

The instructions in the document below are now obsolete and will no longer work.  I am keeping them here archived as many are not aware of Google's change and are still searching and finding this document when looking for ways to add their products to Google.

There are other places to sell online that do submit feeds to Google.  If you click on my About Me page and click through to my store, you will see one such site.

Good luck to all sellers looking for ways to make their items easy to find for customers!

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Just a quick update as of April 2009...

The Google Base Store Connector is not working for some PC users.  Feel free to follow these directions to upload your items as well, PC folks ;-)  It *will* work when the Store Connector does not!

Also, several users have found that eBay has been submitting fixed price and store listings to Google on their behalf, so between this method and eBay's submissions, you should find that your items can be found by shoppers using Google Shopping!
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eBay store sellers know that significant hits to their items can come from Google. PC users can use the Google Base Store Connector to upload their store items to Google. But what is a Mac user to do?

Mac users can still upload their items via an XML file to Google, and, as a bonus, Google will automatically pull the information on a regular schedule, meaning you can set it up and forget about it--a feature not available in the Store Connector software!  So you are one up on your competition using PCs!  :-)

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Setup

1. Create a feed file from ebay
   1. Under your store settings, click on Store Marketing.
   2. Click Make a file of my Store Inventory listings available and click the Apply button.
   3. Note that it can take up to 12 hours for the file to be ready to work with, so take a little break before moving on to the next steps. Go take a nap :-)
   
   
2. Set up a Google Base account
   1. Point your web browser to base.google.com (ebay will not let me put the actual link here, sorry, but if you type the link into your browser it should work).
   2. Click on the Data Feed link in the center of the blue box on the right side of the page.
   3. Click on the Create an Account Now link.
   4. If you already have a Google account (Gmail, for example), you can click on the Sign In Here link at the top of the page. Otherwise fill out the required information.
   
   
3. Register your data feed with Google
   1. Log into Google Base (if you aren't already)
   2. Click on the New Data Feed button
   3. Select your Target Country.
   4. Choose the appropriate Item Type (most people selling on eBay will chose Products).
   5. Select googlebase as the type of the data feed you're registering.
      
   6. Enter the name of your ebay store (with no spaces) followed by .xml
      
   7. Click on Register data feed.
   8. Note that it can take up to 30 minutes before the Data Feed is ready for use, so this is another time to take a little break. Go have some lunch :-)
   
   
4. Link the feed of your eBay account to Google
   1. Under your eBay Store Settings, click on Store Marketing.
   2. Scroll down to Listing Feeds and click Change.
   3. Under Search Engines and Comparison sites, copy the link immediately following the words "Your Google Base-Specific file will be located at".
   4. Log into your Google Base account
   5. Click on the Settings tab
   6. In the Website URL area, paste the link from step 3
   7. Click on Save Changes
      
      
5. Schedule your items to automatically upload
   
   1. Under My Items, click on Data Feeds
   2. Where it says Schedule:None, click on the create link
   3. You can choose the automatic upload to occur daily, weekly or monthly at a specific date/time
   4. Set your timezone, if it isn't already correctly set
   5. If the information isn't already populated in the URL of File area, it is going to be that same link you copied from your Store Marketing page, in step 4.6 above.
   6. Click on Schedule.
      
      
6. Check back a few hours after your upload was scheduled to run to see notification on the page that the upload was a success (you may have to refresh your page to see this). Also, the status of any feed can be found in the Data feeds tab any time you want to check it out.
   
   
7. Errors?
1. Items that do not have a Buy It Now or Fixed Price on them will error out, as Google Base is not intended for auction items.  However, users are reporting that eBay has been submitting their Fixed Price and Auction listings to Google on their behalf, so this should no longer be an issue.
   
2. Items that are listed in more than one store category will give you errors (Google considers them duplicates and only uploads them once each).  Make sure that they were uploaded at least once and then disregard the rest.
3. Invalid characters in titles, like some symbols, etc (such as the accented e in resume, etc) will cause a listing to get rejected from Google Base.  Simply edit your title in ebay and re-upload the file and it should go through.
   
   
8. Keep in mind that it can take up to 24 hours for your file details to actually show up in Google under searches. So do a Google search the day after on some of the keywords in the titles of your items and see your items appear to the world on Google!
   

Good luck and let me know how it works for you, Mac users!  (and PC users too!)