Made by Ben WegScheider who does not have Twitter: http://www.benw.de/. I synced with my girlfriend a couple of times and I loved the simplicity, so I decided to hunt it :). Also check out the experimental work by http://random.nu/
I think another interesting feature to point out, that you can share your excitement with everyone by using the screen as a drawing canvas!
Wildcard (Pre-launch)
plug.dj
Wildcard (Pre-launch)