Chess Puzzle of the Day
A simple module for Joomla 1.5, 1.6, 1.7, and 2.5 which outputs a daily chess puzzle from one of 3 possible sources (Shredder, Gameknot, and ChessGames.com). I like the Shredder one best, as you can choose from 3 difficulty levels, and play out the puzzle right there on your own website. The module has options to let you choose the board size and which site to retrieve the puzzle from, or whether to randomly select a source.