Glad to see this thread. G144A12 does better than you'd expect for 18 bit ALUs doing 32 bit circular shifts and adds, but that costs enough extra instructions that for this particular algorithm at any Bitcoin-useful combination of throughput/energy/cost we can't compete with the genuine 32-bit ALUs of the bigger ATI GPUs. Ya can't be perfect for all problems all the time :) Nevertheless we'll be posting an app note eventually on SHA256 as an illustration of techniques in pipelining. The $20 price is for small quantities. Standard exponential decay curves apply for production quantities; we want to see our chips in people's products and are priced to encourage that. As for 20 somethings, nobody in our company gets a paycheck (yet) so someone has to be willing to work for nothing, but if you have a practical idea for an app note and want to work with us to get it done and published please email greg at greenarraychips dot com and let's discuss it. Thanks for your interest, folks - Greg Bailey, GreenArrays, Inc.