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I'm using both CS2 & Gimp2 (and some other tools)
PS has action which can batch processing while you are sleeping, and it's supporting 48bit colors. that's all.
but on one file filtering, PS faild :p
I can say Gimp is superior than PS if you don't need to batch scanning & processing.

(now I'm using CS2 on filtering, but still I'm using gimp to manual filtering, or crop/rotate, e.t.c. and troubling to get same quality to using Gimp)