The iPhone 2.2.1 update just hit, and it promises to fix various Safari, Mail and Camera bugs.
It applies to iPhone and iPhone 3G (
no iPod Touch yet iPod Touch's update seems like it's here too), and doesn't seem like it introduces new features. We're installing and looking into it for more info. The update is 245.7 MB, in case you're on dial-up at your grandma's house.
Jailbreakers should hold off on installing until it's confirmed that 2.2.1 can be jailbroken, and unlockers should definitely hold on. Thanks windows4life!