This is an albino squirrel, as
featured in the
href="http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=452760&in_page_id=1770">Daily
Mail. They have a gallery of such photos
href="http://www.dailymail.co.uk/pages/galleries/index.html?in_gallery_id=10440&in_page_id=1055">here,
including an amazing albino peacock.
Also, check out the winners of the National Geographic
href="http://ngm.nationalgeographic.com/ngm/photo-contest/animals.html">photo
contest.
That is probably a leucistic, not albino, squirrel. It appears to have dark eyes. (Though it is hard to say from the photo)
Where I live, a huge percentage of the squirrels are either leucistic or melanistic (essentially, black). Grey is just barely in the majority.
I hit a true albino squirrel with my Jeep a couple years ago in Bucks Co. PA (it ran out from the woods! I couldn't avoid it! Really!).
It's probably still in a freezer someplace.