http://gizmodo.com/build-this-tiny-drum-machine-and-rock-out-like-its-198-510153359
oh, sweet. Bleep labs has all sorts of fun stuff.
The Eagle board and schematic files are downloadable here, too:
https://bleeplabs.com/store/the-bleep-drum/
Obviously that won't do much good without the programmed chip though ....
I got one of these as a gift and have yet to put it together. A buddy bought it for me when I regretted selling him my Korg ER-1 MKII. Maybe I need to block out some time for this. Everytime I watch the video I get excited about it again.