I have PS7 and tried out PS CS. The only good change I could find was the ability to warp text along a curve. Other than that, there was no other "new stuff" I could use. Frankly I think PS has been taken as far as it should go. What more could you ask for?
I have PS7... I saw on ther web page that CS can make one picture out of multiples pictures taken side by side... make a large photo out of many pictures... like a x-large wide angle... I wonder if PS7 does that ?
I wouldnt buy CS, Ive used Photoshop since v4, and loved new changes, but I dont think theres enough for the money, and it is still buggy. Stick with v7!...lol