Come for the sloths, stay for the frogs
http://vimeo.com/moogaloop.swf?clip_id=11712103&server=vimeo.com&show_title=1&show_byline=1&show_portrait=1&color=&fullscreen=1
This women in South America is trying to save amphibians - frogs and other creatures are dying because of a deadly fungus that's sweeping the planet.
So, she went to a sloth orphanage and took cute sloth videos, hoping it would go viral so you would come to her site, and help save frogs. Pretty awesome (and the sloths are cute).