Engadget have a full video of the process.
Please note that the software cost $100. While it is cheaper and safer than a hardware hack, if Apple releases an update that locks it up then your screwed.
Please be aware you are purchasing software that will be installed on your computer which will unlock your phone via wifi. In the event Apple comes out with a new firmware upgrade which will lock your phone again you hereby agree that Wireless Imports nor its vendor will be held liable or responcible for unlocking your handset again. If your handset becomes locked you will be charged to unlock it again.