If you've got an external webcam but hate not being able to move around in the narrow frame, DIY web site Instructables shows us how to replace the lens with a cheap wide angle one for more flexible video chatting.
While certain webcam/lens combinations may work better, this particular guide used a $US12 webcam and a $US6 wide-angle lens that didn't fit together just right. Thus, replacing the lens meant moving the socket an extra millimetre away from the circuit board using some previously mentioned Sugru and taking the IR filter off the first lens and attaching it to the wide-angle one.
Apart from the Sugru, though, all you'll need for this mod is a screwdriver to take apart the camera and access the more delicate insides. You'll likely have to do a bit of improvisation for the method to work with your particular webcam (you may not even need to move the socket), but all in all it's a neat idea that can be done very cheaply. Hit the link for more detailed instructions, and let us know your favourite webcam mods in the comments.
Wide-Angle Web Cam [Instructables]