At music-based social network Grooveshark you can search a music database and listen to streaming audio from thousands of artists. Additionally, you can can embed songs you find on Grooveshark into web sites and social networking profiles, and share them with friends via email and instant messages. Here's a Grooveshark embedded tune:
Signing up for an account activates additional features like saved playlists, music suggestions, and access to the social functions of Grooveshark, like browsing the playlists of people who share your musical tastes. Thanks Toribor!
G2P (Google to Person) uses some crafty Google searches to help locate open directories or otherwise shared files. These searches are nothing secret (In fact, take a look at the results, so you can see how it is done. However, it is much easier to remember g2p.org than these complex searches. Really I put this site together to make it easier on me, and then shared it with you