Apple has made the GM (gold master), or final version of iPhone 3.0 available to developers via developer.apple.com in advance of June 17th public release.
Apple VP of iPhone Software, Scott Forstall, reminded developers to download it, test against it, and if their apps didn't work, to get updates done and fast!
WARNING updated: yeah, we got the full text and it applies only as outlined in the comments below. Thanks everyone, we try to err on the side of caution. Luckily devs had access
If you're not a legit developer who needs this now, more than ever -- stay away!