Since last year I've been building a site called openclassical, which has the aim of organizing classical music online. It's been getting a lot of really positive feedback due to the fact it makes browsing - and listening to - classical music really easy. Because it integrates with YouTube, it's free to use.
I'm looking for all and any feedback so I can make the site better. A great deal of music is already listed, including the complete works of Beethoven, Chopin and Rachmaninoff. You can click on any work to listen.