Syncing itunes with two macs, is it possible?

This new iMac has made a whole lot of problems! Sorry if I'm asking way too many questions, I have tried google, but cant seem to find a clear answer.
What I want to do is sync my itunes library from my macbook pro onto my imac, as any new music i download is done on the mpb via a download client (cough cough!) I just dont want to keep transferring them over manually, is there anything that will automatically copy music over and any changes made to either library? Seems like apple have missed a trick here.

cheers