The Nikon learn and explore doesn't have a lot of info. Basically it's a quick run down on ISO, shutter, aperture ect. It's nice though but not a lot of info. I haven't looked at other apps. Let me know if you like any others. I'm going to go check for some now, too.
Re: ***Ris*** & CABunny
I hadn't looked, but I'll check that one out.
Let us know if you find more!
Posts on cloth trainers/PLing