Arduino with onboard Ethernet adapter: Still under development?

Guys
I have just acquired the Freetronics EtherTen, looks like a great board and saves on a shield and throws in SD Storage and PoE. I intend for it to act as a data collector via a network of Xbees and the SD card would be ideal for the data storage. I have not used the SD card on Arduino before, can you please advise if there is a preferred library for the EtherTen to utilize the SD Card ?. Ideally the data format should be compatible with a PC, but not essential.
Thanks in advance