Here’s how to do it:
1. Open installer, go to sources, edit, add, then add this source:
http://www.iphoneroms.com/repo

2. The sources will then refresh. Go back to install and scroll down for what you want to install - emulators, NES roms, SNES roms, GBA roms, Genesis roms, Gameboy roms etc.

3. Select which game you want to install. Install it and then you are good to go.

Don’t waste your time with ssh anymore, this is the automatic way. There is almost no point of even having a Sony PSP or Nintendo DS lite now although those are cool and have good games. Now the iPhone isn’t just a phone, iPod, and a breakthrough internet device, it’s also a fantastic portable game player. Most of the games play better in landscape mode. It’s almost too hard to play most games when holding the iPhone upright as it is just too skinny. Enjoy your iPhone’s new powers if you haven’t done so already.

Source: By Canadian iPhone User - http://www.iphoneuser.ca/