This is my Nordic Semiconductor nRF24L01 driver for atmega8 micro, it should work even with other atmel micro with small changes.
Most of the works is based upon nRF24L01 avr lib by Stefan Engelke http://www.tinkerer.eu/AVRLib/nRF24L01.
Attached you can also find a developement board for atmega8 and cheap nrf24l01 pcb found on ebay.
Code
Notes
- read risk disclaimer
- excuse my bad english