Most of you already know this, but I have been getting a few emails about this, so I’ll post it. eBay changed their API to the new Finding API. This will officially be unavailable aft October 2011. The new Finding API is MUCH better and you’ll definitely benefit by using it.  There is a migration guide available. Unfortunately, it does mean some major code changes. When I say code changes, I’m referring to the request and the variables returned from the response have different syntax, so it’s not too terrible on what needs to be done.

Here is the link to the migration guide:
http://developer.ebay.com/devzone/finding/Concepts/map_FindItemsAdvanced_2_FindingService.html

Hope this helps.