This is with qa0309 (mount-2.10r-2, kernel-2.4.2-0.1.23)

mount doesn't autodetect that mounts of //server/share are of type smb;
unless I'm mistaken in my memory, this is a regression from RH 7.0 which
I think realized that // must be smb shares

# on qa0309 machine:

[root@localhost /mnt]# mount //verdande/exports /mnt/exports -o ro
mount: special device //verdande/exports does not exist
[root@localhost /mnt]# mount -t smb //verdande/exports /mnt/exports -o ro
Password:
[root@localhost /mnt]#