Real-Time:
Look at:

http://www.ndbc.noaa.gov
http://www.vos.noaa.gov

http://www.erh.noaa.gov/er/lwx/marine.htm (Comprehensive Listing of NOAA's marine products)

Historical:
http://www.ndbc.noaa.gov/hmd.shtml
http://www.nodc.noaa.gov
click on Access Data in left frame

http://www.nodc.noaa.gov/OC5/indprod.html (World Ocean Database 2005)
questions: NODC.Services@noaa.gov

For tidal waves: http://www.nws.noaa.gov/organization.php#hq
click on the Tsunami Warning Center links under National Support Centers

Go to National Climatic Data Center web page
http://lwf.ncdc.noaa.gov/oa/ncdc.html

click on Most Popular under Purchase
click on Inventories (at top)
click on NCDC Data Sets
Click on For a complete listing of datasets and products
Scroll down to  DSI-9757,  US Navy Marine Climatic Atlas of the World (average wave heights for each world ocean basin)
Help: Sam McCown
828-271-4800 x3174 ncdc.orders@noaa.gov  

(Monthly) Pilot Charts of the North Atlantic Ocean (now available as Atlas of Pilot Charts North Atlantic Ocean--National Geospatial-Intelligence Agency (formerly National Imagery and Mapping Agency/Defense Mapping Agency) Pub. no. 106) indicate prevailing wind direction and force.   This publication is available  for sale from the Government Printing Office (http://bookstore.gpo.gov/).  The NOAA Central Library in Silver Spring, MD has the old pilot charts but they do not circulate.