wow, they look very impressive

http://www.photosails.com/

but the thought of having to step around huge coke bottles printed on windsurfer sails left intentionally on a crowded beach as a way of getting around beach advertising prohibitions pisses me off ...
however i've no objection to seeing a corona long neck streaking cross the bay at 20knots

you'll know they have market penetration when somali pirates
have huge skull and cross bones on their sails and exhortations to pray 5 times a day or to take it up with your maker

windsurfers offer lots of fun possibilities