This is a sled mount and clip design for the original BeagleBoard. Simply clip your BeagleBoard into place and add a 400-point breadboard then start experimenting. Works with really old versions as well as the new ones (note that it's not compatible with the BeagleBoad-xM, that's another beast entirely).
Cut the black lines, etch the red ones. Cut clips from 1/8" Delrin and everything else from 3mm acrylic.
For a kit of this thing go here: