netbios-ns dgram udp wait root /usr/sbin/tcpd /usr/sbin/nmbd -a netbios-ssn stream tcp nowait root /usr/sbin/tcpd /usr/sbin/smbd
I think these lines are for running samba servers, which I'm not trying to do (I just wanted to access samba shares as a client machine). You probably don't need them if you're just a client machine, too, so you could safely skip this section.
I didn't need to do anything to my /etc/samba/smb.conf file (note the slightly different location -- no longer is it just in /etc) -- I chose to manage it with dpkg, and it generated a great one for me.