FreeNAS Howto Install
FreeNAS HowTo Guides
These guides are intended to get you a running implementation of FreeNAS with minimal research. Almost all of what you will need is contained in these guides.
pdf to accompany the tutorial
http://www.ComputerProOnsite.com/freenas.pdf
Graphical Tutorial
http://www.freenas.org/contrib/sloan/freenas1.htm
The FreeNAS Setup and User Guide can be found here.
http://www.freenas.org/downloads/docs/user-docs/FreeNAS-SUG.pdf
Linux.com posted an interesting article on FreeNAS here.