On Embedded projects from around the web you'll find descriptions of the timers in ATMega 328 microcontrollers and the way to program them:
8-bit Timer/Counter0 operation modes.Part1
8-bit Timer/Counter0 operation modes.Part2
Programming 16 bit timer on Atmega328
AVR Timer2 asynchronous mode
Very useful, I should have had this before I started the Multitimer2 library. Maybe I'll do a rewrite on the day I have time for that..