Developers can now download the beta 3 (7A280f) update of the iPhone OS 3.0. There are no details on the changes in the update but the new SDK which comes along with it has brought changes to various components like Xcode, Interface builder and Dashcode.
Apple has also confirmed a bug that does not allow apps developed for pre OS 3.0 to be tested on this update.
[Via Macrumors]
what29 says
I was a genius and bricked my iphone trying to update to beta 3 but i found the website i linked in my name above and they were able to get me up and running in a couple minutes, just my 2 cents for anyone in the same boat i was.