CDM recently posted about aurora, an open source hardware mixer.
From the aurora website:
aurora is a usb powered multichannel mixer in a typical dj form factor. the device features two linear channel faders, a single a/b crossfader and eight backlit buttons. twenty four backlit knobs allow you to control effects. aurora, unlike most midi controllers, enhances performances with controllable ambient lighting. aurora easily integrates with your favorite midi compatible software.
This thing looks badd-a$$
since aurora is an open source project they got all the info to BUILD YOUR OWN... sweet.
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.
If you sign up to their mailing list, they'll get in touch with you when they start selling pre-assembled versions.... also cool.
Check the aurora website for more information.