The title pretty well says it all: check out this list, especially the first few (new in CS4/5).
Having written a version of a book covering just Photoshop shortcuts, I pride myself on my knowledge here, and even I picked up a few good tips from this list.
Wow! Birdseye view and simultaneous zoom are awesome! 🙂
The list is good but the first shortcut Drag-Zoom is really unexpected from tutsplus. We can simply use Alt + mouse scroll to zoom in/out but they say Command/Ctrl + Space + Click and Drag Left/Right isn’t it too bad?
Very cool. Thanks!
@Rabin: I guess it’s for wacom users then 🙂