Apple just released an update to iTunes, bringing the latest version to 9.0.2.
iTunes 9.0.2 adds support for Apple TV software version 3.0, adds an option for a dark background for Grid View, and improves support for accessibility.
According to PreCentral.net, this update also kills Palm Pre webOS sync. Again.
You can download iTunes here or through software update.
Updated: MuscleNerd has just confirmed that the update does not affect the Jailbreak, users can still use custom firmware. You can easily upgrade to 9.0.2.