Here's a nice little tool for Microsoft LifeCam's. It solves the problem we have in our UC boot camp labs, where pressing the hardware button on the webcam will cause Live Messenger to launch -
Microsoft headsets and webcams are optimized for Windows Live Messenger through the Call Button. Until now, there has not been a simple means to configure the Call Button to start Office Communicator. The goal of the Call Button Integration Support kit (the kit) is to change that.