Apple just released an update to iTunes with version 10.1.1 which apparently fixes some issues with syncing and unexpected crashes. I personally never experienced this issue but I guess it was a problem for some of you.
iTunes 10.1.1 seems to be safe for jailbreakers and unlockers but it might be a wise thing to wait for an official confirmation from a Dev Team member. In the meanwhile, this is the changelog for iTunes 10.1.1…
• Addresses an issue where some music videos may not play on Macs equipped with NVIDIA GeForce 9400 or 9600 graphics.
• Resolves an issue where iTunes may unexpectedly quit when deleting a playlist that has the iTunes Sidebar showing.
• Fixes a problem where iTunes may unexpectedly quit when connecting an iPod to a Mac equipped with a PowerPC processor.
• Addresses an issue where some music videos may not sync to an iPod, iPhone, or iPad.
We’ll update this post as soon as it is confirmed to be safe for jailbreakers. Check back soon.