I first spotted Ripple on illustrator Peggy Fussell's blog a couple days ago, and since then have spotted it all over the place. Started by Kelly Light, its a collection of original art pieces for sale and all the proceeds go to help animal victims of the gulf oil spill.
Basically the deal is, you donate $10 to one of those organizations, and then email Kelly your receipt and what art piece you'd like to buy. More info here.
If you're an artist and would like to donate, email email@example.com for more info.