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...