Today Apple released 2.2.1 - and what this brings up are several questions.

What was fixed/upgraded in 2.2.1?

• Safari stability issues
• E-mailing photo bugs resolved

Can I upgrade?

Hold off until the QuickPwn & PwnageTool are updated.

2G iPhone

So for now, absolutely not. The iPhone 2G has the same baseband, but the jailbreak method will require an update.

3G iPhone

2.2.1 will ruin yellowsn0w as far as we know.  It will most definitely not work - the 3G baseband has been updated to 2.30.03.

The iPhone 2.2.1 SDK was just released, so developers can grab it now!