New Pwnage tool to Jailbreak iPhone firmware 2.2 has been released with a few warnings for iPhone 3G users.

From the Dev-Team Blog:
# GOLDEN RULE: If you have a 3G iPhone and want potential soft unlock in the near future do NOT use QuickPwn, and do not use the official ipsw or the iTunes update process without using PwnageTool.
# Read item 1 again and again.
# At the bottom of this post are the bittorrent files for the latest versions of PwnageTool and QuickPwn.
# These are suitable for the recent 2.2 release.
# Please read all parts of this post before downloading and using these tools.
# The ‘late 2008’ MacBook/air/pro line of computers have an issue with DFU mode. While it’s possible to go from Pwned 2.1 -> Pwned 2.2 (using PwnageTool), you can’t yet go from stock to pwned. If in any doubt use a different machine.
# Choosing the correct tool is crucial. Be warned!
Read more & Downloads here:
blog.iphone-dev.org