Good timing with this thread. My attempt is with making iOS games. Trying to mix pleasure and profit. First attempt is http://clumsyandthestars.com/. Working on a second one now...
Good luck! I'm trying the same thing myself with http://yata.ca. It's more of a party game played with the iOS device, and thought the interactivity with people in the same room would add to the fun. Hope all's well with the second one!