Small Business Computing is currently running a nice Samba article. The piece is an overview of Samba, emphasizing why small businesses should consider Samba for file and print serving.

You should be thinking about converting if you are interested in substantial hardware and software savings. If all you need is file and printer services, Windows Server 2003 (Small Business Server or Standard Edition) starting at $500 per server, not to mention the fairly hefty hardware requirements, is not cheap. One of my customers was able to recycle a few obsolete Windows Server machines as Linux/Samba file servers for essentially no money.

There is also some good information here on Samba's origins and an introduction to Samba features. This might be a nice piece to point people to if they're considering Samba for the first time.

See Do the Samba with Linux File Servers for the complete article.