On monday a commercial version to remove the iphone SIM lock was launched. It took the iphone dev team one or two days (depending on how you count it) to release a free version. They claim (and I tend to believe them) that this tool is not a hacked hack but a new implementation. The unlock process needs the usual activation/ssh hack and is nothing for the faint hearted, but works. A couple of hours ago a GUI version was released, which I haven't tried.
Before starting to brick your phone, do the following.
One thing to remember (really)
To see what's supported visit www.hacktheiphone.com, the iphone forum on hackint0sh.org/ and/or http://www.iphone-ticker.de/.
The tools:
What you've just read is already old news.