>> Windsurfing 
AHD boards.
Mistral windsurf boards.
F2 boards.
Fanatic boards.
JP Australia boards.
Naish boards and sails.
Bic boards.
Neil Pryde sails and hardware.
Starboard boards
Tushingham sails.
Gaastra sails.
Boards windsurfing magazine.
The Seavets' website

 >> Minorca / Menorca 
Menorca Walking Holidays (like us, without boats: "walking holidays to be enjoyed not endured")
10 person Catamaran trips from Fornells.
Expedition windsurfing around Menorca.

 >> Weather 
Inshore waters forecast from Spanish Met Office(the best, but in Spanish).
Wind and Wave info from Spanish Met Office (excellent, but Spanish)
Realtime (usually) data from Mahon airport.
Oceanweather.com (find out if the water is warm, amongst other things).
Basic 10 day forecast for Mallorca.
WeatherOnline

 >> More links 
RYA (Royal Yachting Association)
AITO (Association of Independent Travel Agents)
ATOL (Air Travel Organisers' Licensing)