Apple just released iPhone OS 3.0.1, an update to existing 3.0 users. Apparently this update only fixes the iPhone SMS exploit, which is a good thing of course.
If you’re redsn0w/yellwsn0w user you should note that 3.0.1 does work, but you need to select firmware 3.0 when doing the jailbreak. As always, check out the iPhone Dev Team blog before updating your unlocked/jailbroken iPhone.
