I've been trying Photoshop 7.0 in Crossover Office 5.0.1, and it almost appears to be working. I got the program error message, but solved this (it was a TWAIN problem - After a few tries, a box popped up saying that there was an error with the TWAIN drivers, and everything started working).
However, there's a minor problem with the 'Save for web' option. If I choose GIF as the file type, the 'Colours' select box has '??@?' as the contents. If I click the dropdown arrow and choose a number, it says 'Value must be numeric' (or something similar, I'm not near my Linux PC at the moment) and crashes. Anyone know of a solution for this?