Mixcastr
Mixcastr was a weekend project of mine built with Twitter Bootstrap, Ruby+Sinatra, and the SoundCloud Javascript SDK.
Users provide a string for input, and Mixcastr sends it off to SoundCloud. I get back an array of matches, parse them, and then append them to the page as clickable track cover art. When a user clicks the track cover art, a second request is sent to SoundCloud for the .mp3, which is loaded into the browser using the HTML5 Audio tag.
I hope to revisit Mixcastr in the future - perhaps adding users and playlists.
The live project is viewable at mixcastr.com and source can be viewed at its GitHub repo.