Chess Puzzle of the Day
A simple module for all versions of Joomla from 1.5 to 3.0 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.
Patch for Joomla 1.0 on PHP 5.3
This patch enables Joomla 1.0 to run on a server with PHP 5.3. If you have third party templates, components, modules, etc. you might need to make a few more adjustments - see my blog post about Joomla 1.0 and PHP 5.3.