Ahh, I figured it out. The key is to set up the shapes so they broadcast like an outerproduct, but using bitwise_and as the operation and the second operand as the bit filter. So we temporarily expand each bit to a byte for numarray to be able to use it for dot products. If you use a temporary Boolean variable to store the bitwise_and ufunc output, the answer is automatically converted to boolean.
Set up the shapes for an innerproduct-like operation to go from byte format back to bit compact Uint8 format. Go numarray! -- http://mail.python.org/mailman/listinfo/python-list
