Apple have released pre-release iPhone OS 3.0 beta 4 for developers along with iTunes 8.2. Both pre-release versions offer some key changes.

Key changes of iPhone OS 3.0 beta include the requirement for 10.5.7 or later in order to synchronize the new Notes apps.  iTunes 8.2 now allows users to play music on their computer while updating their iPhone or iPod touch with new software.

[via SlashGear]