Ahhh... I'm still on 10.5.8...
Man... seems like such a fundamental thing to leave out. I'd sacrifice a drop shadow here or there for some functionality. Also a "cut" (cmd+x) for files and folders in open and save dialogue windows in all applications, like Windows. I like to move stuff around sometimes while I'm opening or saving files in Photoshop or whatever...
C'mon Apple... get on it.