FreeNAS and Couchpotato

A good guide is available here:

Freenas 9.2.0 with Transmission and Couchpotato/Sickbeard as a DLNA-Server

[How-To] Transmission & FreeNAS Shared Mount Points

There is a great tutorial on how to set up FreeNAS with Transmission on the FreeNAS forums:

[How-To] Transmission & FreeNAS Shared Mount Points