The Washington Post Company (NYSE:WPO) is an American education and media company, best known for owning the newspaper it is named after, The Washington Post.
This site does not function properly in either Firefox or Opera, which is unbelievably negligent. Much of it is filled with pretentious conservative editorializing that is a waste of the informed citizen's time.
Slightly to the left of Karl Marx politically, but generally well-written and enjoyable web content. I'd strongly recommend using AdBlock or Spybot S&D, though---Slate's not above using web bugs and other minor tracking features.