blacksn0w Released On Cydia for iPhone Unlock
If you are stuck with iPhone 3G or 3GS with baseband 05.11.07 unlock, Geohot has released his blacksn0w tool to unlock your iPhone. You will also need blackra1n to jailbreak your iPhone first before you can install the blacksn0w.

blackra1n RC3 is also live for both Windows and Mac!!! Clean firmware 3.1.2 and baseband 05.11.07 are recommended.
Updates:
Unlock!!!
Hacktivation
Keep legit activation if activated before running app
15 seconds faster, you’ll feel it
Tiger + PPC supportGo to blackra1n.com to download
It appears some users are having wifi issues. Try a “Reset Network Settings” Also, this just enables custom MobileConfig files. To fully enable tethering, go here on your iPhone and download a MobileConfig file for your carrier. Watch out for carrier fees for tethering.
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http://www.screensleuth.com Screen Sleuth
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http://newgadgetworld.com/?s=unlock+iphone&search=Search Kandis Bartolini