Today, Apple held an iPhone OS 3.0 Preview event for developers and the press. The upgrade itself won’t be available to end users until summer so as a developer you’re looking at a minimum 3 month lead time to develop updates and new products based around the new features. This hasn’t stopped the blogosphere going crazy with the news, however, so we’ve collected together some of the best links for you to catch up on: Watch the event itself: You can watch a stream of the iPhone OS 3.0 event on Apple’s site. Get the new SDK: Naturally, Apple has its own page with a very brief summary of the new SDK features with a link through the usual place to get the new SDK. Be alert, though, as I’ve seen reports overnight on Twitter saying that installing the 3.0 SDK will lock your phone into testing mode, mirroring what it says in the Pre-Installation Advisory. Others suggest you can “work around” this with DFU mode. Basically, be careful out there - this could all well be wrong so don’t shoot the messenger A giant overview of all the new features: Gizmodo has put together a great “everything you need to know” post about iPhone OS 3.0.

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More here:
10 Useful Links about the iPhone OS 3.0 Preview for Developers