It would be nice to get adobe Photoshop
I use photoshop a lot. I plan to get an iPad. But, I have little use for photoshop on the iPad. Why? The files I work on in photoshop are huge. They'd not only fill up the memory quickly, they'd bog-down the machine. Plus, 1024 x 768 just isn't enough resolution to do anything very productive with photoshop. Photoshop often calls for a great deal of precise work (I favor a wacom pad for that), that's kind of hard with your fingers. I'll stick to doing my photoshop work on my desktop.
Maybe there is some use for an iPad optimized photoshop-like simple image editing program (so you could do some simple image editing to insert photos into some of the iWork apps) but it would look quite a bit different than photoshop. I'm sure there will be a wide array of such programs...