[ALUG] Webcam, what software?

This seems very stupid but I can't really work out what Linux software can do useful things with a Webcam. The obvious thing to want to do is to show what the webcam is seeing on the web. I have apache 2.2 running. Also, any good voip type applications that have both Linux and Windows versions anc can use a webcam for video phonecalls? Skype doesn't have video on Linux. -- Chris Green