Apple has today released a new beta of iPhone OS 3.0 to registered iPhone developers. Beta 4 comes with build 7A300 of iPhone OS 3.0 and with the accompanying SDK labelled build 9M2734.
In addition Apple released a pre-release version of iTunes 8.2 to developers. To install the latest iPhone OS 3.0, iTunes 8.2 must be installed.
World of Apple will provide details of updates iPhone OS 3.0b4 and iTunes 8.2