3 websites I have found interesting:
http://www.comcast.net/a/ - I have a Comcast account and this is the home page for it. What I like is it has a variety of information: In the News, Latest Headlines, Top Videos, and Sports stories.http://www.nytimes.com/learning/teachers/xwords/index.html - This website publishes 2 crossword puzzles a month that can be played online or printed. They organize the puzzles for teachers in subjects that they can use in schools. There are additional educational links on the side.
http://www.websudoku.com/ - This website provides Sudoku puzzles in four different levels: Easy, Medium, Hard & Evil.