I was curious because I had been letting the camera process JPGs, but have now switched to RAW.
I've been using that combo software package Adobe Photoshop Elements (a.k.a. cheap version) 6.0 + Premier Elements (video editor) just for managing the library of photos (like Picasa does).
I just recently tried using the Photoshop Elements photo editor and am amazed at what people can do with it, but the most I've been able to do in the past 2 days of learning is to make people's skin turn green and blacken their teeth.
It's a bummer that a printed manual is NOT supplied with the Adobe Photoshop software! I have to get everything online!