Weather

Forecasts

Inshore Waters Forecast
Shipping Forecast
Shipping Forecast (plain text)
UK Forecast (Met Office - very good)
High Seas / Storm warnings
BBC Coast and Sea (lots of information and very good)
BBC Coastal forecast Selsey Bill to St Albans Head

Meteo France

US National Weather Service NOAA site (incredibly comprehensive worldwide)
MetVU - a Kiwi site which does worldwide forecast charts
ECMWF forecast (surface pressure, geostrophic wind)
Theyr.tv - great site from Iceland  (sadly now chargeable)
Accuweather
Weather.co.uk 10 day forecasts
Weatheronline
Metcheck
WindGuru

XC Weather - now includes forecasts
Weatherweb - you have to buy forecasts from here
Wetterzentrale (German site which is very good)
Westwind (more choices in presentation)
Magic Seaweed (very good for animated wind and swell)

Irish Waters
Mediterranean Waters around Italy (Italian Site, very good)

Grib US - a very good site to download a view which gets you updated wind forecasts - excellent