Practically speaking, how do you use a small SSD? Assuming you're going to have a larger external drive (at least when you're not traveling), what goes where? For myself, I imagine I would put my media on the external drive and my applications on the SSD, but what about everything else? Is there a practical advantage to storing Word documents on a faster drive, for instance? And what about splitting up your iTunes library between the two I'd hate to be without my music when I'm on the road, but would this be more trouble than it's worth?