These allow you to upload files, do some basic editing, and share with a group.
These services have closed: Jumpcut, Eyespot, MovieMasher, Cuts, Muveemix
Minimal features: Veotag, Graffiti, BubblePly
Needs to be installed locally: MovieMasher
Not sure: GorillaSpot, YouTube Remixer, Editor One
Note: iPod Nano 5th Generation video format: mp4, 640x480, 29.97 fps, Video: H.264, 2.6 mbps, Audio: AAC Stereo 128 kbps
Another Option is to edit locally, and upload the video to collaborative services such as Ning, Google Sites, PBWorks (Used to be PBWiki), Wikispaces, etc.
Not sure that the on-line video editing services have adequate collaboration features.