Are you interested in HF marine communications? Then you need to download the two marine band frequency list below courtesy of coastalradio.org and Robert Maskill, G4PYR.
MF Coastal & Maritime Stations 1608 to 4000 kHz (last update 2-8-2007): http://www.coastalradio.org.uk/coastmf.pdf
MF W/T Coastal Radio Stations 305 to 574 kHz (last update 2-2-2007):
http://www.coastalradio.org.uk/500khz.pdf
You will find all sorts of HF marine goodies on Robert's Coastal Radio Communications website at http://www.coastalradio.org.uk/index.htm. This site is well worth the visit and I highly recommend it.