Your screwed. My wife had this happen also. And we had to download everything again. But this time we did it the right way ...
Lime Wire Official Website & Free Download, BitTorrent . Once a Ipod tries to sync with a new library it askes you if you want to sync it with the new library, if you say yes, then it erases everything. But if you say no, then it won't sync at all.
Not unless someone knows of a hidden software out there!