What would be involved with helping beta test?  I am comfortable soldering SMD, IC's, etc.  What about sourcing the components; switches, plates, pcb, etc?  And what sort of testing are you looking for?
Good point, I can solder (arguably), program, construct cases, have the components but not sure what parts you are looking to test specifically.
My plan was to put everything needed into a box, and send that out: PCB, atmega, mini usb, crystal, caps, resistors, diodes...  I have some leds as well and could include appropriate resistors if people want to pick from the colors that I happen to have (blue, green, orange, I believe) - there are only 6 LEDs supported natively, the other 34 would have to have some kind of accessory board to operate.
Testing would involve... building it, making sure it works?  There are only 2 places with alternate key locations.  I intend to also test using the expansion pads (on the right side of the board) to add in a keypad to the matrix.
Maybe document what problems, or whatever you find along the way that could be fixed?  That's all that comes to mind right now.  
Now I need to ping Metalliqaz to make sure this version get supported in his firmware.
The only thing I don't have are switches.