Can I transfer and view xvid (avi) videos on an iPad? What type of video files can I watch on my iPad?

I usually only have .avi files; is there an app that will allow me to play them?
You could also try AirVideo, which will convert and stream xvid (and other formats) from a local PC.  You can connect to it via local network or remotely as well.http://www.inmethod.com/air-video/index.html