This is an unsorted (but tagged) list of cool things other people have done and then posted their own set of instructions about how they did it that might be useful later for one of my own projects.
I just found this on Hack a day. This dude's crazy, reducing things down to the most minimal hardware you can use. This project powers a microcontroller from a single AA battery with a switching power supply inside the microcontroller.
This is far more LEDs with PWM than I've ever attempted to drive from a single AVR... but quite cool. Reducing things down to 16 discrete values seems to help quite a bit...