The latest beta version for iPhone's 3.0 OS is finally live for all of you guys swimming in the Dev Center waters. The SDK is now available on the Apple servers for all registered developers.
Reports indicate that there doesn't seem to be an substantial difference between this and the previous beta 2. Maybe some slight code clean up and speed enhancements, but nothing all that noticeable.
With the latest beta just going live, we've yet to hear anything on the jailbreaking side of things. Expect the usual people to give word on beta 3's hackability soon enough. With beta 2 getting a jailbreak for developers, it could be possible that beta 3 might get the same treatment.