Its still RC keep in mind, but according to the site, unlock is in place. I have been holding off on upgrading from 3.0 till I was sure I could unlock. Now I have no plans to unlock from AT&T, but I always want to be sure I CAN if I need to. So it looks like we are in business. From the site:
new visitors, go to blackra1n.com download and have fun
blackra1n RC3 is also live for both Windows and Mac!!! Clean firmware 3.1.2 and baseband 05.11.07 are recommended.
Keep legit activation if activated before running app
15 seconds faster, you’ll feel it
Tiger + PPC support
I will most likely upgrade and hack my phone this weekend. I’ll post up my experience.