Richard Herskowitz's DRAM387 Contemporary Independent Film and Video: Collage Media, Spring 2004.
At ifilm you can find music videos and more
OFFScreen screens independent, experimental, foreign, and classic films every week. Maybe you should check 'em out...
The Lost Film Festival showcases a bunch of shorts and found-footage films, mostly with a liberal or anarchist slant.
The Ms. Films Festival: pretty self-explanatory - a film festival and resource locale for the ladies among us.
Transmission Films - yet another place to watch some flicks online; only problem is, these aren't free, but if you're willing to pay, some of 'em look worthwhile...
Microcinema International: another online film resource/database. They have some trailers of some of their collage-y films available here.
Interested in reading more abuot film collages using animation? Check out the articles at Bright Lights Film to read more. Although many of the article's focus on films that are wholly animated, its interesting to look for areas of overlap...
A far as film as media, I would suggest that we think of the screenplay as a form of collage as well. Films like City of God or Pulp Fiction.
Also, BMW Films is pretty money.