I guess this application beats other ways to unlock your iPhone or iTouch as the easiest. Just plug in your iTouch, launch the application and click the button and the application called “Blackra1n” does the rest. This software is made by George Hotz, one of the original members of the dev team in the jailbreak community. I just learned he got kicked out because he prematurely published information on the iPhone hack.
The easier a software can handle the things it needs to do, the more people would prefer to use it. Blackra1n is by far the easiest one to use. And it works on the latest iPhone and iTouch models too ;). Look it up in Google. The software has both Windows and Mac OS versions.