Here is the complete list (As far as I am aware) of ATI & Nvidia cards that can be used to crunch GPU capable projects.
BOINC GPU Compatibility List is a Google Docs spreadsheet here (Link
The Google spreadsheet will allow the viewer to print it or download the page in any of the following formats: HTML, OpenOffice, Excel, PDF, Text or CSV. To download click on File > Download as > [Select Format]. To print click the printer icon under the File Menu.
Here is the list of all BOINC Projects that offer GPU apps