Documentation:
Samba Documentation
http://us1.samba.org/samba/docs/
List of Samba resources from the official Samba website
 
Samba Wiki
http://wiki.samba.org/index.php/Main_Page
Samba Wiki for Developers
 

 

 
Useful Links:

 

 
Training:
Using Samba, 2nd Edition
http://www.samba.org/samba/docs/using_samba/toc...
Free on-line printing of a comprehensive guide to Samba administration. This version is from 2003.
 
How to Configure Samba on RedHat Linux
http://www.daniweb.com/tutorials/tutorial1741.html