The Aurora mixer is an open source 'usb powered multichannel mixer' project. In other words its a box for manipulating two audio tracks simultaneously through a laptop, similarly to mixing using decks, except there are no big bags of vinyl.
Its another well documented open source project, this time from some MIT/Virginia Tech/Yale boffins: Matt Aldrich, Mike Garbus and Maro Sciacchitano, the latter being responsible for the 'form factor', which I take to mean industrial design. The files for the top panel are available in Front Panel Designer format, apparently something of a standard for enclosure design - surely Ponoko could be used as an alternative for applications such as this, in which case it would be good to see some translation between this format and .eps - this would certainly make the project that little bit more open in my opinion.
Vive le difference.
The Aurora website carries a quite impressive video demonstrating its functions - a good example of passionate designers spotting a gap in the market and filling it with their own open design. The designers invite collaboration, with a careful disclaimer:
"... the intent of publishing the files is to generate interest in the community, not to make you rich. we are interested in seeing how you use aurora, feel free to post any mods in the forum."
Images from the auroramixer's Flickrstream