Heffee uses a formula that takes into account the input from websites, moderators and expecially the users to decide which news across the internet is the most important. Users can create their own customized feeds, save pages and articles from across the web, and subscribe to their favorite news outlets.
Reader Otter points out in his journal a very neat use for the logic contained in Debian's package dependency resolver: solving sudoku puzzles. To me at least, this is much more interesting than the sudoku puzzles themselves. Update: 08/24 02:51 GMT by T : Hackaday just ran a story that might tickle the same parts of your brain on a game played entirely with MySQL database queries.