For the last few months I have been writing a WordPress plugin called wp-swimteam.  This plugin builds on top of WordPress to turn it into an application which can be used to manage a youth swim team.  The plugin is hosted on SourceForge and I am using a blog on that site to track the development progress.  It is going pretty well, I am having fun working on it as it will be a huge benefit to our swim team which has been driven by a paper process forever.