This inspired me to go poke around at it, and see what it had to offer before it went away. And mainly what I discovered was a vast long list of songs, without any way to tell much about them before downloading them. The same problem occurs to me in music stores, so I don't suppose this was too surprising ... and I suppose the solution is the same; one figures these sorts of things out based at least in part on recommendations from other people. So, in this spirit, I'll offer some of the things that I've found there, and ask for recommendations from anyone else who's reading this and has found interesting stuff.
Flight of the Dragon Riders, Symphonic Chronicles. It's electronic classical, in a very dramatic movie-score sort of style; very much the sort of thing that I enjoy listening to on my way to work in the morning.
Thunderstorm, Guy in the Woods. A very nice recording -- recording montage, actually -- of a thunderstorm. Very nicely done, and no distracting instrumentals stuck over it like most of the storm recordings sold in stores.
Internet Cello Society. A collection of various classical cello pieces, mostly old standbys.
Tomo Iwakura. Classical guitar; pieces by various composers.
Anyone else have things they'd suggest?