CUPS not seeing shared Windows printers

[Peter Flynn]

I'm running CUPS on Ubuntu Edgy connected to my domestic network which 
includes Windows machines used by others in the household. Most of them 
have shared their printers to the rest of the network, but CUPS can't 
see any of them.

Under Global Settings in the Printers applet, Detect LAN Printers is 
checked, but none appear, and if I try to add a Network Printer set to 
SMB, it asks for passwords for users I've never heard of (but none of 
them use passwords, either on their Windows login or on their shares -- 
I checked) and then finds nothing.

Is there some extra piece of manual configuration needed somewhere?

If I run xsmbrowser, I can see all their shares and printers easily, so 
I'm guessing there's nothing wrong with the network setup, only with CUPS.

///Peter