I did, but it always has problems finding my Nexus One, it is very annoying
this is probably a problem with mounting your phone to your computer. if you download the doubletwist app on your phone (which is an excellent replacement for the default music player) it will automount your phone when you plug it in.
Does the playcount sync work?
exactly what dajmeister says. but also make sure you drop down the notification bar and choose "mount sd" that might solve you're problem.