At work, I opened my iPod in iTunes, and pasted in lyrics. When I got home, I set my iPod to synchronize, and then checked - my lyrics were not on that song. So I set it back to manual so I could check that song on my iPod - the lyrics are gone. It appears that synchronization goes only one way - at least for lyrics (I didn't test other things such as rating). This doesn't make sense to me. If I rate my song on my iPod, I want it to stay rated.