I use Microsoft Movie Maker myself. I import the avi clips, edit them down, add music or mute the sound track, add titles, merge in any effects, and compress. I tend to choose options that give you a nice large image and the filesize is rather large, but then I don't run them as long as a full length song either. I just fade in and out what I need.
Yep, I'll be at MACNA. We plan to do some podcasting from there either during the day or at least at night from the bar. I don't know if we can handle vidcasting, but maybe if my laptop can handle the task. I'll have to test it out just to see, rather than finding out once I'm in Houston.