When games aren't designed explicitly for touch screens, from the ground up, I tend to pass. This means I've missed out on top notch ports such as Grand Theft Auto III. No matter how well implemented the controls are, I find it difficult to play these games without being completely conscious of the controls. Players have had the ability to use SIXAXIS controllers to play games on Android for a while now, but that remained a little tricky and cumbersome. Until the GameKlip.
I love this thing. The GameKlip is one of those things that just seems totally obvious. So obvious I don't understand why it hasn't been done until this point. Really, it's just a piece of plastic, but that piece of plastic just solves so many issues with connecting a controller to a phone. I'm cursed with an iPhone at the moment, but if I had an Android phone I'd almost certainly pick one of these things up.