!!!!!!!!!! Help! Please! Urgent!!!!!!
This morning I was working on a UI for an iPhone I wanna make in Photoshop, it was looking pretty good but then Photoshop crashed, that was fine because I just saved it before the crash but now when I try to open it I get the following error message:

I can't open it in Preview or any of the other CS4 applications. any help would be much appreciated thanks.
ps, I'm running Photoshop CS4 Extended on OSX Leopard.
EDIT: Aren't Mac screenshots sooo sexy, shadows and everything