The Internet Party: What happens when Google's parents leave town for the weekend. (So digg, ebaY and Facebook walk into a room…)
EDIT: New video links added…
Sithentology: Darth Vader's indoctrination video (Tom Cruise parody, obviously).
MacHEADS trailer: A movie about another cult ("I've never knowingly slept with a Windows user. Ever. That would never happen.")