Nuggio webcam is a nice idea ^^ but pay attention: MSN may kick you out because of flooding..
for webcam stuff: have a look at gstreamer and it's python bindings, I was able to do a quick movie player with it and v4l(2) should work too:
gst-launch-0.10 v4lsrc ! video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace ! xvimagesink
f.e. .. Some webcams are using v4l2src nowadays...
OR you could try with mencoder (mplayer), but I'm not sure if it's possible to make still jpgs with mencoder .. ^^