We're interested in neurophysiology and brain hacking, and are building a multichannel EEG to experiment with.
Join our mailing list at EEG@lists.noisebridge.net
Skim the list archives to get an idea of what we are doing. https://www.noisebridge.net/mailman/listinfo/eeg
An immediate plan is to build a multi-channel rig using multiple OpenEEG boards ((http://openeeg.sourceforge.net/doc/). Several of us have built two-channel versions; the digital motherboard will support up to six (three analog boards). We have acquired a 19(?) -electrode head cap and Tracy built a nice enclosure with mini-XLR jacks. We have some neurobiology, signal processing and machine learning expertise on board, so all we need to do is to put everything together!
Discussion on our setup is on the OpenEEG page.