Here is what worked for me...

First in the terminal (as root) use:

%cd /usr/libexec/cups/backend
%ln -s /usr/bin/smbspool smb

(essentially link /usr/bin/smbspool to /usr/libexec/cups/backend/smb)

reboot or restart cups by kill -HUP cups PID (whatever that PID might be).

using the print center, add a printer while holding the option button. In the drop down list should be 'Advanced'. Select it.

For device choose 'Windows Printer via Samba' and then give the printer a name.

The syntax I needed to use was:

smb://user:password@workgroup/server/sharename

Anyway, this worked for me... hope this helps!

Cheers!
Chris

Just in case it matters, I'm printing to an HP LaserJet 2100M connected to a computer running Windows 2000.

You can see an entire thread on this at
http://forums.macnn.com/showthread....50&pagenumber=1