Tutorials

Jailbreaking
You can read lots of tutorials on iClarified. Also have a look on the ground rules concerning tutorials.

Unlocking

 * TurboSIM Unlock, for iPhone 3G
 * Unlock firmware version 2.0 with WinPwn 2.0, for original iPhone

Troubleshooting

 * Troubleshoot Winpwn-iTunes common errors

Semi-Technical

 * Mounting ramdisk of ipsw beta 4-7

Reversing

 * Setting up IDA Pro Advanced to reverse the baseband

Resources
Check also the link section.