A simple how-to (Windows):
Update (02/11/2007 6:01 PM MST): Mac stuff removed from guide.
Update (02/13/2007 9:51 AM MST): GUI version is out, much easier!
Update (02/13/2007 12:45 PM MST): ZiPhone 2.0 now out! Guide updated.
Update (02/14/2007 12:32 PM MST): ZiPhone 2.1 now out! Guide updated.
Update (02/15/2007 9:14 AM MST): ZiPhone 2.2 now out. Verbose option removed. Guide updated.
Update (02/16/2007 2:18 PM MST): ZiPhone 2.3 now out. Guide updated.
Update (02/18/2007 9:41 AM MST): ZiPhone 2.4 now out. GUI version not included. Guide not updated.
1.) Perform a full restore to 1.1.3 via iTunes. You want to be on freshly restored 1.1.3. Don't bother syncing to iTunes, you can do that later. You can accept to restore from your previous backup now, or wait till you are finished jailbreaking 1.1.3.
2.) Download
ZiPhone2.3.zip (download updated 2/18/2007 9:41 AM MST) and extract its contents into a folder on your computer. Under Windows I recommend creating the folder c:\ZiPhone and extracting the contents there.
3.) Open "My Computer" and navigate to c:\ZiPhone, or wherever you extracted the contents of ZiPhone.zip. Double-click into the ZiPhone folder and then double-click ziphoneGUI.exe.
4.) At the main ZiPhone GUI screen check-off Jailbreak. Click start.
5.) That's it! You will have Installer on your springboard. Enjoy. Close ZiPhone GUI.
(The actual jailbreak process takes less than 3 minutes!)
Success! By FAR this was way easier than the previous jailbreak methods.
--
Mike