All In My Box

http://allinmybox.appspot.com

Allows non-djs to whip up sweet 1 hour mixes in seconds (err, minutes, considering the time to actually beat-match the songs on the server). The drag and drop interface allows users to choose genres and artists and drop them onto a timeline. We use the Echo Nest api to get tracks from the selected genres and artists and stitch them together to create a mix that flows from artist to genre and back again.

We used Sound Manager to create a custom player for the generated mixes. The player allows you to seek through the entire track, get notifications when one song transitions to another (and what those respective songs are), and pause/play repeatedly until a new mix is made.