Did you ever get your issue resolved? I just had the same issue with the latest 2.2 update. However, I went in to the running applications and started to disable some running apps and the camera started working again. So I wonder what ever resolved your issue?
Went to Verizon and they re-insalled 2.2. Wiped out my data, but fortunately I had just done a backup. Camera worked, and after reinstalling apps, it quit working. I disabled some apps, and it works. I suspect Anti Droid Theft, but am afraid to reload it.