Spellocity is a new spelling game out for iOS devices for $.99 and while there are other games out in the market, this title may be more worth your time and the dollar that the devs are asking for it. Instead of drawing a line between letters to form a word, Spellocity presents you with a wall of letters and lets you pick whichever you want in order to form words for points. There is even a demo up that you can try, if you don't want to blindly throw money at people.
I tried the demo, and enjoyed it. I may never win a spelling bee, but I still had fun trying to come up with long, point-heavy words. The game is only out for the iPad and iPhone right now, but there is an Android version in the works. I will be waiting for that one, so I can give these guys some money. It will be money well spent.