As promised in the keynote, Apple is now serving iPhone OS 3.0 to developers. The links have been online since shortly after the keynote, but only now do they appear to be working.
Developers should take note that Apple’s servers are overwhelmed, and that you may have to try to connect multiple times.
Apple is leaving a little room to developers to pull escrow on the GM status. By referring to it as a “GM Seed”, Apple is cautioning developers that the release could be superseded on the 17th, if any last minute show-stopping bugs are found.