I only noticed how this worked last night, I think it's great!
How does it work if you've got two computers? Can i share the same library?
I think it would be good if we could share our Friends iTunes library as well, maybe with the icloud this may become possible!
I used to do this with orblive, my mate did a bit of medical testing so was cooped up in a hospital, so I could email my mate a link and he could access my iTunes library, and my video library, quite cool.