I've found this game called "Chinese Characters Fly" on the itunes store.
The idea is that you drag characters around and match them. Not much to it.
There are two modes. The main mode isn't of much interest to me (eg, drag 口 and 八 to make 叭), but the second one is. It asks you to match up simplified and traditional characters.
It's not going to replace study of traditional characters on Skritter (i'll get round to that eventually), but it does at very least act as a nice introduction for recognising them.