Not sure how long Spotify has had this ability, but after running spotify to play local files from a usb HD library plugged into the notebook I disconnected the drive and put it back onto the network. If I select the local files within Spotify it still finds them and they still play. So unlike iTunes which gets in a right flap if you change drive locations, Spotify seems to search and track the drive location and finds it pretty much instantly. So now you can have your local library and everything out there on Spotify playing from one player, nice and seamless.
