Technologies: Django, jQuery
When I'm not coding, there's a decent probability I'm swing dancing. I've been dancing since I was a kid, and since coming to Stanford I joined Swingtime, a Lindy Hop performance troupe. During my final year, I've taken over as a co-artistic director and thus end up teaching a lot of Choreography (which I admittedly love doing).
The problem is - Choreography is incredibly hard to convey by any means other than having someone dance in front of you. Up until recently, many of us have relied on excel spreadsheets with counts marked out explicitly. Lining up these counts with the actual music secondhand is quite a challenge.
I put together this simple Django app with the aid of the jPlayer plugin for jQuery (which I modified to always use Flash instead of HTML5 Audio, which is buggy). As the song plays, the app shows the corresponding move. It's simple, effective, and by no means done. It's not particularly high on my priorities, but expect slow progress.