iPhone OS 3.1. We'll let you know if we see anything crazy, like usable Gmail, true background applications, or a notification UI that doesn't make you want to throw the phone against a very hard surface at high velocity.
Update: Looks like Apple has closed the door on hacks that enable tethering in this release -- at least for AT&T according to early reports.
Update 2: We've just been informed that beta 2 also introduces what appears to be a public API for manipulating live video. Devs are still testing the capabilities but it could open the door for augmented reality applications like Layar to come to the iPhone 3GS.
iPhone OS 3.1 beta 2 released (update: disables tethering, enables AR?)
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