There is a CAN Dicussion Forum which you can find in the main webpage of discussion forums.The link to the main webpage is the following:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=0&RSESSION=101_27601:41b2a8704d7abfcf7fb9e3a5:1017769485225
There, at the bottom, you will find Industrial Networks, where CAN is a link under it.
Hope this helps,
Aguila