Idiots Guide to AVR programming reference

As I move along with the Idiots Guide to AVR programming, updates and references will be posted here:

Datasheets:
Atmel 328P datasheet: http://www.atmel.com/dyn/resources/prod_documents/doc8271.pdf

AVR-C:
Lib C Documentation: http://www.nongnu.org/avr-libc/user-manual/index.html