A few years back when I was using kde, kopete supported webcams for
chat, but not with the aim protocol as I recall, but for yahoo and msn
protocols. Things may have changed since then, but there should also be
video capability coming soon to empathy.

aMSN does support video..............

The easiest piece of software for video on Ubuntu is Skype. A lot of the video
features with the others require both of you to be using Ubuntu, Skype works
across platforms.

If you have the mediabuntu repos installed then just look up Skype in synaptic.
OR get the latest version from
www.skype.com/intl/en/download/skype/linux/choose/

I often use Skype for videoconferencing. It requires a pretty powerful
computer. The video part won't work on a 6-year-old system I have, but it works
great on my AMD Phenom II X2 system.

Also, there is a commercial web site called Elluminate which is for multi-site
videoconferences. They have a free-for-personal-use version of the software
which supports up to three videoconference locations. The app is written in
Java, so it works on Linux, Windows or Mac.

I have a cheap and crummy webcam I bought in China for less than $10. It works
in Cheese, and Skype and Elluminate.