I don't work for Google, but I have an eBay store on eBay. My seller
name on eBay is snifflesmouse.

I am sharing how I successfully scheduled eBay store items for upload
to Google Base because I want to help other people like me, but any
use of this information is your responsibility. Only store items will
be uploaded, not fixed price or auction items.  Here is what worked for me:

1. Go to eBay and click "My eBay"

2. Click "Manage My Store" on the left side of the page

3. Click on "Listing Distribution" under promotional tools

4. Click "Activate your Store listings via RSS. (not sure if this
is needed for Google)

5. Click "Make a file of your Store Inventory listings available"

6. May need to wait at least 12 hours before you continue with
these instructions

7. When eBay provides you with a URL of your Google Base-specific
file, COPY THE URL - looks something like: http://esssl.ebay.com/GetListings/yourstorename?fmt=g

8. Sign in to Google Base at: http://www.google.com/base (or click the sign in link and create a new account if you don't have one already)

9. Click the "Settings" tab

10. Change your Website URL to match the Google Base URL provided by
eBay - again, looks something like: http://esssl.ebay.com/GetListings/yourstorename?fmt=g

11. Click the "My Items" tab

12. Click on the "Data Feeds" link

13. Click the "New Data Feed" button

14. Type a file name with the .xml extention - should be the name of
your store with no spaces - for example, "mystorename.xml"

15. Change the item type in the drop down menu to "Products"

16. Click the button that says: "Register data feed and continue to
formatting instructions"

17. Scroll down to the bottom of the page and click the button that
says: "I'm done formatting my file. Continue to upload"

18. If you need to, click the "My Items" tab, then click on the "Data
Feeds" link (or continue to step 19 below)

19. Click the "create" link next to Schedule

20. Choose when and how often you would like Google to upload your
file

21. Type the URL of the file - should match the URL provided by eBay
- the same one used in step 10 above

22. CLICK THE SCHEDULE BUTTON

23. Come back and check to see if your products have been uploaded as
scheduled - login to Google Base, click the "my items" tab, click the
"active items" link. You should see all of your store items listed
(they will not upload auction or fixed price listings)

Below Are Links to more help with scheduling items for upload provided by Google:

http://googlebase.blogspot.com/2007/11/schedule-your-data-feeds.html

http://base.google.com/support/bin/answer.py?answer=76749