Khan Academy. The Khan Academy is a not-for-profit organization with the mission of providing a high quality education to anyone, anywhere. They have 1000+ videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance which have been recorded by Salman Khan. He is a gifted teacher.
Ted: Ideas Worth Spreading. Inspired talks by the world's greatest thinkers and doers. Do yourself a favor and check this out!
Free Rice. A fun vocabulary quiz. For every word for which you select the correct definition, 20 grains of rice is donated to fight hunger. A fun way to increase your vocabulary and to help humanity.
Sudoku puzzles. Sudoku puzzles to print out and work. Standard level; also have easy, hard, and more.
Seed Magazine Thought-provoking website. On their home page, check out Seed's Daily Zeitgeist. Five issues, insights, and observations shaping our perspective, from the editors of Seed. Changes daily. Very interesting.
Coast Guard History. Coast Guard history and links.
Epicurious. Recipes and lots more.