There are a monster number of libraries for this device. I'd like to collect links to them all in one place. Can you post any link (s) you have/use here please.
Hello here is one i think is less common, but is working really well for me.
info:
http://www.elecfreaks.com/wiki/index.php?title=2.4G_Wireless_nRF24L01p
direct download:
http://elecfreaks.com/store/download/datasheet/rf/rf24l01/SPI_rf24L01.zip
There is 2 versions on the page but only SPI_Demo_rf24L01 works on newer Arduino versions.
Radio Head RadioHead: RH_NRF24 Class Reference
airspayce NRF24: NRF24 Class Reference