Blacksn0w RC2 is released and available for Download from Cydia.

Blacksn0w RC2 is an unlocking / Jail Breaking tool for iPhone 3.1.3 05.11.07 baseband.
The tool is the Official Tool.
This unofficial release is released by Steve.This is not the official tool, but an unofficial one released by Steve, the guy behind the PushFix 2.0 tool. Blacksn0w RC2 is a repackaged version of the original blacksn0w RC and the fix which was released two days back.
Blacksn0w RC2 can Unlock / JailBreak iPhone 3G/3GS 3.1.3 05.11.07 Baseband
How to Unlock Iphone using Blacksn0w RC2?
- Checks your *real* firmware version using your kernel version (this avoids using the reported firmware version which might be “faked”). Only installs if you are really running 3.1.2 or 3.1.3
- Checks your baseband version – only installs if 05.11.07
- Properly backs up and restores your configuration if uninstalled
Also Remember to first add the source “http://cydia.pushfix.info/” and then install Blacksn0w RC2 to unlock your iPhone 3.1.3
via < a href="http://www.sizzledcore.com/2010/03/22/blacksn0w-rc2-download-unlock-iphone-313-05-11-07-baseband-iphone-3g-3gs/" target="_blank">sizzledcore
I used This site since it has a nearly perfect 4.9/5 rating with google checkout and is accredited with the better business bureau and an “A” Rating with them.
plus they were recommended highly in the cell phone forums.
http://www.unlockcellphonecode.com
I talked to one of their support reps on live chat and within 5 mins my phone was unlocked.
Hope this helps.
another good news for apple iphone user, this info nihar
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Can I download NZB with rutorrent?