lala.com, the CD trading site, has a new site design with new features. Foremost, you can stream tracks from numerous albums. I just listened to a track The Secret Agent from a Philip Glass album on my "want list." They also have a page to see the most wanted and most played albums and to my surprise, classical music is a choice. And according to that page, John Zorn's Absinthe/Naked City is the #1 most requested classical CD ahead of the Emerson String Quartet playing Bartok. Finally, the Reich Remixed 2006 album appears to be available for full streaming of all tracks.
By the way, I've started populating an aworks playlist on lala.