I've got 5 Austin Critical Mass videos on my local bike web log:
http://atxbs.com/?q=node/18
And here's a direct link to to the latest one (from September's ride):
http://youtube.com/watch?v=vojL2oi_8-c
We've been seeing an increase in riders from about 80 a month in the spring up to over 150 this last ride (October). Yay growing bike community!