Hey, there is a complete guide on youtube of how to put GpsPhone (GBA) ROMs on your iPhone/iPod Touch!!!
Here are the links:
Part 1:

[ame="http://www.youtube.com/watch?v=lx6tavzm-F0"]YouTube - How to put GBA or gpsPhone ROMs on your Ipod Touch(Part 1)[/ame]

Part 2:

[ame="http://www.youtube.com/watch?v=raSOjzO5A9s"]YouTube - How to put GBA or gpsPhone ROMs on your Ipod Touch(Part 2)[/ame]

Part 3:

[ame="http://www.youtube.com/watch?v=7kqNXcGR5Js&feature=related"]YouTube - How to put GBA or gpsPhone ROMs on your Ipod Touch(Part3)[/ame]

Hope you like them!!!!