An Apple knowledge base article may help solve an issue with syncing in iTunes (versions 7, 8, and 9).
For some users, updating to iTunes 9.0.2 has come with a test in patience. Libraries of various sizes have experienced hangs when updating, some as long as 36 hours.
Apple released iTunes 9.0.2 and the update included improvements to app sorting for the iPhone and iPod Touch.
Apple has released a couple of updates: one for iTunes, bringing the latest software version to 9.0.2, and the other for Apple TV, which updates the software to version 3.0.
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