A couple of quick videos from Natsume USA showing off its battling bots on the PSP in Carnage Hearts EXA. While the battlegrounds are a bit sparse, I love the combat and there's a bit of strategy behind it as your develop your Overkill Engines.
Also, the game has one really neat trick. You can record battles and they'll be uploaded to YouTube so you can share them with friends, definitely something more portable games should offer. The game is coming to the US PSN soon, hoping for an EU release.