Wired News is reporting a rumor gangs of thieves have stolen new PowerBooks from MacWorld.
I doubt that's true... because when the original (blue & orange) iBooks were introduced at MacWorld New York in 1999, one of the protoype iBooks was lifted from the show floor (this wasn't just a rumor, it was confirmed to me by an Apple employee).
I would hope that security's been beefed up since then...