A new beta version of the iPhone OS 3.0 and associated SDK has been released by Apple. You can upgrade your iPhone is you have been using the beta 3 to experience greater stability, some enhancement in MMS support, Apple Push API and probably some more.
Apple has just announced the Apple Developer Forums—a new benefit for developers in the iPhone Developer Standard Program, Enterprise Program, and University Program. Currently in beta, the Apple Developer Forums provide a collaborative environment to post iPhone development topics and questions for an open discussion with other iPhone developers and Apple engineers.
I think it's a good idea to wait a bit with commenting the announement of big things. You might not be as fast as others, but at least will have a broader view to the whole picture. At least that's what I did with Steve jobs announcement about the iPhone SDK (official press release is here) and developer program.
I'm a big fan of Simon Judge's blog, Mobile Phone Development, and I read his article about Q3/2007 Smartphone Market Share with great interest. I agree with his findings, however, I would add my own thoughts to it, too.