From the samba-technical mailing list.  I thought this problem was fixed ages ago:

http://samba.cadcamlab.org/lists/samba-technical/May2002/00360.html

From: Jianliang Lu <j.lu@tiesse.com>
To: samba-technical@lists.samba.org
X-OriginatingIP: 151.24.153.138 (lu)
Subject: Browsing problem for printers on Samba3.0 a24.
Reply-To: j.lu@tiesse.com
                                                                               
                                   
When a user would add a printer, that was shared on Samba, on his NT machine,
he cannot find the printers from the shared list. The problem is that the
browsing flag of Samba does not include the SV_TYPE_PRINTQ_SERVER
(0x00000200), so a rap API_NetServerEnum2 (104) was failed to get printer
servers.
I think that we should put the "default_server_announce |=
SV_TYPE_PRINTQ_SERVER;" on the routine "set_default_server_announce_type",
because the "update_server_announce_as_printserver" was called only by the
smbd, not nmbd, that was responsible for the browsing announcement.
                                                                               
                                   
Jianliang Lu
TieSse s.p.a.
Via Jervis, 60.  10015 Ivrea (To) - Italy
j.lu@tiesse.com
luj@libero.it