That's awesome. I have a couple of PCBs I'm selling on my website (www.logos-electro.com) that use daisy-chained 595s to drive high current outputs. Would you mind if I linked to your code once it's up?
Yea, sure you can. I am working on integrating the code into another one of my projects (which I may or may not make open source), so in the future it /may/ not be open to the public (probably will stay open tho ;D ). I would love to help you with your project. The code it set up so its not very hard to make it work for just about any PWM (or just basic HIGH/LOW) output to 595's.