I just saw this today and it's definitely worth sharing. (Thanks Erin for sharing.)
(photo from jezebel.com)
Go here to read the whole story but basically the sweaters are needed to keep the penguins from preening and cleaning themselves while they are covered in oil from a massive oil spill. This could poison them and lead to their death.
So...if you are an animal lover and a knitter, please consider this. :) There is a pattern for the sweater posted on the link provided above.