Wojciech Kosma has an external that supposedly allows Max to interface with Skype. Not sure exactly what it's capable of, and the download site is currently down but it may be worth checking back:

wojciechkosma.art.pl/soft

Or contacting him directly:

wk@theps.net

jit.broadcast? jit.qt.broadcast?

I was thinking of something along those lines. I found some windows software, fakewebcam.exe , or some deal like that advertises to be able to stream video from a URL into MSN/yahoo messenger. Unfortunately I haven't found a decent webcam-faker program that is usable or isn't infested with trojans yet, but either way I think that the video would lag too much. I'm looking for a more direct route.

Perhaps quartz composer and ichat may be a solution? I didn't install it yet.