Those enterprising homebrew code jockeys have been putting the iPhone 3GS to good use. Its 600MHz processor and increased RAM seems to be outperforming even its closest rivals, and Pocket Gamer takes a look as the Apple handset is happily runs a PlayStation emulator, and plays a full version of Final Fantasy VII.
The 3GS is also shown running a fully operational DS version of Pokemon, though naturally you're not likely to be seeing these on the App Store any time soon.