For the Samsung ML-2251N

    * Config-Webinterface: localhost:631
    * You have to use HP JetDirect/AppSocket as connection type.
    * THE PRINTER DOES NOT UNDERSTAND POSTSCRIPT, even if autodetect-tools tell you so. it only 'speaks' SPL(thanks to whoever picked that printermodel ... )
    * URL for printer: socket://89.22.6.20:9100
    * PPD-File ("driver"): ML-2250spl2.ppd
    * You also need a certain filter-programm. Unfortunately, the filter is provided binary-only for linux and windows.
    * * Linux: Copy the binary-only filter to /usr/lib/cups/filter/: rastertosamsungspl
    * * MacOS X: Copy /usr/libexec/cups/filter/rastertospl2 to /usr/libexec/cups/filter/rastertosamsungspl.
    * * FreeBSD: Good luck. Tell us if you got it working. 

    * * DON'T FORGET TO chmod 755 the filter file (e.g. chmod 755 /usr/lib/cups/filter/)