Basic information on coasts:
http://mbgnet.mobot.org/salt/sandy/index.htm
Coastal Engineering Manual :
http://chl.erdc.usace.army.mil/CHL.aspx?p=s&a=ARTICLES;104
Java Applets on Waves:
http://www.coastal.udel.edu/faculty/rad/index.html
Coastal webpage:
http://www.coastal-guide.com/
WHOI:
http://www.whoi.edu/institutes/coi/index.htm
Ocean data by NOAA:
http://www.nodc.noaa.gov/
Tide Prediction Norway:
http://www.math.uio.no/tidepred/index.shtml?language=eng
Intergovernmental Oceanographic Commission:
http://ioc.unesco.org/iocweb/index.php
Europe coastal info:
http://www.coastalguide.org/
Tides and tide prediction:
http://scilib.ucsd.edu/sio/tide/