I don't know if you guys have seen this neat hack or not, but it sure is great for those who use Arduinos and aren't proficient in low level hex or assembler/machine code. Instead of using PIC508M's for small stuff I've (maybe become lazy) really like using the arduino's C style IDE so this was a neat library you can't do without.
Check out how to make small (ie tiny ) circuits from arduino code with minimal fuss.
http://highlowtech.org/?p=1695
Ye ol' Blink example only needs the chip, resistor, led and 3V
ATtiny85 Backpack
Re: ATtiny85 Backpack
Thats a pretty handy resource BeJay. Yes, talking of lazy, before the RPi, I did a lot of work using PICAXE chips: http://www.picaxe.com/ they use a nice high level language and are still relatively cheep.
Re: ATtiny85 Backpack
My whole logger system runs on PICAXEs I liked the built in RS232 that was very handy for me back then, now I'm reinventing the wheel so I can have everything on ethernet instead. They are a great stepping stone to micros and FPGAs in general