UPDATED: According to the screenshot we just received, looks like Apple has, for the first time, re-jiggered the order of Apps on the Home Screen (previously they just added iTunes and then App Store). Now Voice Memo takes Clocks spot, Notes switches with Calculator, Clock goes where Notes was, and Calculator bumps Settings to the bottom row along with iTunes and App Store, which move left a slot to make room. Not sure about this new arrangement, what do you think?
Also, there's apparently a new Settings panel for Store, although it sounds like it's blank right now.
ORIGINAL: Sneaking in just before the end of March, Apple has released iPhone OS 3.0 Beta 2, both SDK and firmware to developers. If you're spinning apps for this summer's big release, head on over to developer.apple.com and get your download on.
TiPB has already done a fairly extensive iPhone 3.0 walkthrough of the front-facing elements of Beta 1, but we'll have to wait for the usual deep-code divers out on the internet to let us know if there's anything new surfaced in Beta 2.