US Sailing collects donations specifically for Olympic sailors. Go to the website, and you will see several options.
It's not obvious if you can make a donation to specifically help multihull sailors, but I'm sure if you called and made that a condition of your donation, they wouldn't turn you away.
As Bob mentioned, you can always donate to a specific team of your choice if you prefer.
We may mock curling all day long, but they get a TON of air time...
Mike
