Apple today released the LED Cinema Display iSight Firmware Update 1.0, an update that fixes an issue with iSights built into Apple monitors.

According to the company, before the correction the webcam was not recognized in certain applications, on certain occasions.
The update requires Mac OS X 10.5.8 Leopard or 10.6.2 Snow Leopard (or higher) and a Mac with an Intel processor. Your download weighs just 654KB; more details can be obtained in this Apple support article.