First off, this is awesome. Check out what I've made using it at dwhacks.blogspot.ca
Second, I have a question about PWM. I know theres 2 dedicated PWM pins, 0 and 1, but I've also read that pin 4 (actual pin 3) can be used as PWM without "software PWM". Does this work with your core? I havent been able to figure it out, but I was trying to make a simple code to fade through colors with an RGB LED. Anyone done this that I've missed?
And finally, why not include a "boards.txt" and the proper folder structure in the download?