The DevTeam has released Pwnage Tool and QuickPwn 2.2 (Windows folks only have QuickPwn).
We are uploading mirrors now, and will get you links ASAP. I'll have a full guide on upgrading from 2.1 to 2.2 here in the next hour.
edit: 3G Jailbreak Guide is here
A few cautions:
DO NOT USE QUICKPWN if you want to have a potential software unlock on your 3G iPhone anytime soon. QuickPwn will update your baseband to the new one included in the 2.2 update. This == bad. Use PwnageTool to create a custom 2.2 firmware. OS X guide will be up soon.