They tell you all the places that are round the world to visit. Well all that people have been prepared to describe thus far. It also has a surfing variant of the same style. Add your local spot onto it and see how many of the 'locals' you can upset.
Blackwater Sailing Club
Great weather site, Live weather feed, just click on their page.
http://www.wmyc.org.uk/WeatherStation.php - Very Very local weather. Accurate unless the wind goes North East, then it is in the lee of the island.
Forces-of-Nature
Brilliant site in terms of covering all watersports medium. Forum, gear for sale etc, mostly south west based, but if you crave waves it is good to get a fix through this site.
Snow Forecast.com
Worldwide alpine forecast for snow, resort information, holiday information etc. Free use of three day forecast, long range extras for members on the site. Good site reviews.