The Apple website has announced that iTunes 9.0 and iPhone OS 3.1 have been released. Apple also has information related to their new line of iPods.
The new iTunes has a nifty feature that lets you organize your apps from within iTunes (rather than on the device itself).
See this InformationWeek article for more details.
The feature I'm eagerly anticipating, the ability to skip song tracks using the controls on my Motorola S9 stereo bluetooth head set. OS 3.0 introduced stereo bluetooth to the iPhone, but for some reason did not include the ability to skip forward / back song tracks.
iTunes 9.0 is ready to download now, the OS update is supposed to be out today (Wed) but it's not yet shown up in iTunes.