I just bought a locked Iphone and found out it has the newest (06.02) bootloader. I am absolutely certain that there is no way to software-unlock this version, we will just have to wait untill the 3.0 OS is officialy released and the Iphone-dev guys unlock that version.
I have also tried using some turbosims to unlock it, but none of them work... 🙁 Fortunately I tried it at a store that refunds when it doesn't work 😀