I'm running Linux 3.1.2-1.fc16.x86_64, Fedora 16 (64-bit) with Xfce. I have a Microsoft (Hisss!) LifeCam HD-5000. I'm trying to get Google Talk voice/video chat to work.
I've gotten as far as starting up video, and my friend and I can see each other, and I can hear her, but she can't hear me. I tried using another webcam because I wondered if the microphone was broken, but the other webcam has the same problem. After switching back to my own webcam, I've tried recording audio on Vocaroo.com, and that actually works okay.
The only problem, apparently, is picking up audio in Google Talk.