As expected, the Dev Team has released RedSn0w 0.9.14b1 tonight. The new version of the jailbreak tool features the highly-anticipated ability to downgrade the baseband on the iPhone 3G(S).
Unlocked 3G(S) users stuck on baseband 06.15 can now downgrade to 05.13.04. This will restore GPS functionality, as well as allow you to use stock IPSWs again. Full details after the break...