Idk if y'all have heard, but Trendy released a game called Dungeon Defenders: Second Wave for the iOS. It is a virtual replica of the PC/xbox 360 game, and surprisingly it plays very well from what I've played so far. It is not quite as robust as the full version (i.e. no survival mode and some other stuff), but it is absolutely worth the mere .99 cent price tag.
The controls can be a bit difficult to grasp, but I think that Trendy actually did a really good job with it. Anyway, I thought that any of you DD fans/ iPhone users may have wanted to hear about this.