Sorry for sporadic replies, exam period and all ;(
I am using the module with a 2560 at the moment.
The pinout I am using is:
MISO - 50
MOSI - 51
SCLK - 52
nSS - 10
Make sure you give it 3.3V Power
Make sure you have the updated libraries - http://www.wiznettechnology.com/sub_modules/en/product/Product_Detail.asp?cate1=5&cate2=42&cate3=0&pid=1161#tab
I can't remember if there were any other changes I had to make to the library, because I had some error messages thrown up but I can't remember what they were. Let me know if you have any other problems.