Gyache offers one of the best webcam integration. although, It's older version did not supported v4l and v4l2 type webcame integration (layman term :newer webcam , integrated in the lattest laptops)
I have tested version 1.1.59, which supports both v4l and v4l2.
Download it from : https://launchpad.net/%7Eloell/+archive/+files/gyachi_1.1.59-1~intrepid1_i386.deb
Problem : the program is not maintained by a single authority...
-- Mihir Patel