Here is a list of guides for iPhone hacking, jailbreaking, and unlocking. How To’s:

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Read our guides. But if you need interactive immediate assistance, join our IRC channel #iphone on efnet.

Apps:
Summerboard Themes - Describes how to install and use Summerboard in order to run themes.
Install and use SSH/SCP - How to install and use SSH/SCP to modify files on your phone.
Using BossPrefs - How to use BossPrefs and how to create a plug-in toggle yourself.

Media:
Custom ringtones - How to create and set custom ringtones on your phone.

Hacking / Jailbreaking:
Pwnage 2.0 - Jailbreak and unlock your iPhone OS 2.0 (v2.0 or 2.0.1) phone on OSX.
Winpwn 2.0 - Winpwn 2.0 is out. Jailbreak and unlock your iPhone OS 2.0 (2.0 or 2.0.1) phone on Windows.
Winpwn 2.5 - Winpwn 2.5 is out. Jailbreak and unlock your iPhone/iPod Touch OS 2.9 (2.0, 2.0.x).
Quick Pwn Guide - Jailbreak your iPhone 2.0 on Windows without a restore!
Jailbreak (Pwn) 2.0 Windows - Jailbreak your 2.0 in Windows. This is an unofficial guide and the winpwn 2.0 guide should be used instead.
Jailbreak (Pwn) 3g Windows - Jailbreak your iPhone 3g in Windows. This is an unofficial guide and the winpwn 2.0 guide should be used instead.
XPWN - Pwn in windows using XPWN. This is a full pwn solution for advanced users for Windows. Winpwn is out now and should be used instead. Updated for 2.0.1.
2.0 to 1.1.4 downgrade - Upgraded to 2.0? Can’t downgrade? Here’s your answer.
iPhone 1.1.4 jailbreak / unlock - How to jailbreak (install apps) or unlock (get onto another carrier’s network like Tmobile).
iLiberty - How to jailbreak, unlock, with iLiberty GUI for Windows and OSX.
Tzones - How to use $5.99 T-Mobile Tzones for your unlimited data plan.
BigBoss’s Recommended iPhone - Shows how to set up the phone just like BigBoss does!
Importing from SIM - How to import contacts from your SIM card into iPhone.

General Help:
Enter DFU Mode - How to enter DFU mode to restore your phone without errors.
Restore in iTunes - How to restore your phone back to factory state. Also covers various iTunes errors and solutions.
iPhone Firmwares - Where to get older iPhone firmware files and how to program them.

Troubleshooting:
Troubleshooting Installer - Understanding how installer works and how to fix problems.
No Sound - Troubleshoot your issues if you are not hearing sounds.
Enable Syslog - How to enable the syslog to see NSLog messages on 2.0 FW.