World Community Grid just released GPU Workunits that seem to work on OpenCL 1.1 capable AMD and nVidia cards:
News Article
I'm crunching the Help Conquer Cancer nVidia WU on my GTX 550 Ti right now and the workunits are puny but I'm getting a lot of them. Has anyone tried this on AMD hardware yet? If I win one of those Trinity chips I'll go at it 24/7 on these.
