If you're going to share cutscenes, please keep the videos hosted somewhere that isn't public. While nobody usually minds if you use bits of video and whatever from games for fan projects like music videos and machinima, distributing an entire cutscene, piece of music or other significant resources puts you in the frame for a latter from a lawyer. Game developers usually don't like their material being all over the place like that, either!
In short, I'll have to remove links if entire cutscenes or mp3s from the game are posted. As long as you both own it, sending via a PM is all fine and dandy though. ;)
If you actually own the game on the PC, you can rip them yourself using RAD Video Tools (
http://www.radgametools.com/bnkdown.htm), which can open and convert all of Psychonauts' video files. It can probably do the same for the Xbox and PS2 versions as long as you can get your PC to read their DVDs!