I did a search, and was surprised this wasn't mentioned anywhere here, so I decided to post about it. This app can manipulate your iSight - change the brightness, colors, etc. And it works in any program that the iSight works in, including iChat AV. Check it out here
This solves the darkness problems many was complaining about with the iSight.
This solves the darkness problems many was complaining about with the iSight.