Found this interesting article in Lifehacker: I really don't have THAT many songs to slow down iTunes enough to require a separate library -- but hey, maybe other 'muggers will find a use for this? The iPhoto tip is NEAT though. Now I can separate my Photo Libraries which have grown to a point where it actually DOES slow down iPhoto.
thanks, webmikey. The iTunes tip is new. The iPhoto isn't: http://www.philmug.ph/forum/showthread.php?t=11677&highlight=multiple+libraries I always wondered though why Apple implemented this on iPhoto but not in iTunes.