PowerBook 15" 1.25 512. I too am anticipating a 12/13" MacBook Pro. I've had it since 2003 and it still runs like a champ, but I am on the road so often that I need something more portable. Maybe the iPhone will offer a decent, albeit basic, workspace.
That said, I still am waiting for Apple to get their act together and release a 12" MacBook Pro. I'd like to be able to run a variety of operating systems via Parallels. Interfacing with the corporate/industrial world unfortunately necessitates the use of Windows-only software. Virtual PC just doesn't cut it. Rumours suggest that one may be in the works but, for now, they seem to be just wishful thinking from other like-minded individuals.