I second Bonestructure, I actually have been using CS2 at work for the last year and found all the new things great additions but not really a necessity. But if you are going the photoshop way, make sure you don't go for anything less than version 7, as that has some very useful features.

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-'I curse the day my curiosity led me to investigate the strange stain inside
the atomic acelerator chamber'-
The Nuked Bug