dev & jailbreaking > http://www.touchdev.net/ or just use ZiPhone

guide for 2.0 firmware using Pwnage Tool > http://forums.macrumors.com/showthread.php?t=462648

step by step guide for 1.1.3 >http://www.ipodtouchfans.com/forums/showthread.php?t=30044

step by step guide for 1.1.2 > http://lifehacker.com/337863/how-to-install-third+party-apps-on-your-new-iphone-or-ipod-touch

http://code.google.com/p/itouc/

diagnostic mode > http://www.ilounge.com/index.php/articles/comments/ipod-touch-diagnostic-mode-revealed-in-pictures/

http://www.saurik.com/id/4