I you use mount -t cifs //my.host/mydir it will ask you for password. You will get the prompt even if there is no password on //my.host/mydir. That is especially a problem if you want to use /etc/fstab for auto mount.

Works for:

newer Debian, Ubuntu, CentOS distros.
Linux distros with CIFS support

Just add -o user=,password= and there will be mount with no prompt.

> mount -t cifs //my.host/mydir  -o user=,password= /mnt/samba 

and inside of fstab it would be :
less /etc/fstab

//my.host/svn    /mnt/samba             cifs    rw,nounix,user=,password=      0 0