Foiling is all the craze right now in the sailing world, primarily due to the Americas Cup foiling catamarans but now this technology is finding its way into the smaller length sailing classes. Now the Laser is foiling, which looks like fun but is $6,000 worth the price when you can get a used Moth for that same price... I think not. I am sure at some point someone else will come up with a more affordable foil kit however it's not likely it will ever be class legal.
If you do not know what a Moth is check out this video... The Moth is going to be my next boat (if you can call it a boat)