Why does everybody want the Properties window back on the right?
Because from where I'm sitting, I see only 2 sections within File Properties that even have editable fields, and I can open them both up and still have plenty of room for the tree above it.
Now granted, I haven't added a ton of extra fields, and I don't have a ton of view schemes defined. I used to, but then figured out that the only 3 fields I was ever really interested in were Artist, Album and Genre.
So what are you all using File Properties for? Are you really spending this much time organizing your music? Don't you ever just listen to it?
Besides, with the prototype that I'm using, the tree hardly scrolls, so I can open up File Properties even more, thus giving me access to the library and Properties quite nicely. I don't think having the file properties on the right would work with this kind of interface.