Web-based application i like b-sides takes a peek at your uploaded iTunes library and, based on your listening habits and collection, suggests new tracks to check out. To use i like b-sides (their non-capitalisation, not ours), browse your computer to find the XML file that contains your iTunes database—and consequently all of your music information, most frequently played songs, rated songs, etc.—zip it up and upload it on the webapp's main page. Once you've uploaded your musical fingerprint, i like b-sides analyses your library and suggests new music that you may be unaware of, as well as songs in your collection that you may have overlooked. It's basically a more automated way of building a "lost songs" playlist. The site suggests a few dozen songs at a time, with audio previews and purchase links for the iTunes store and Amazon. If the suggestions seem a bit off, you can always hit the shuffle button and get a whole new list of suggestions. For more ways to discover new music, check out our feature on downloading and listening to free music on the web.