hiya analog,
Eh mate if you want the low down on I2C check out the serial communications book by square 1. It 1 thick book and explains serail pic'n in all flavours from rs232,spi,i2c,microwire and 1 wire. although its aimed at the 16f pic's I reckon you'll be pressed to a better explaination on those protocols in 1 book anywhere.
Hope this Helps
Cheers Bryan