BossList is a task management plugin for WordPress by the-boss-1 that allows you to make simple to-do lists for task management.
The plugin comes with custom post type allowing you to organize your lists by filtering categories. Whether you are planning an adventure, going to shopping or simply keeping track of your daily to-dos. Also comes with a custom widget allowing you to show lists in any widget location or sidebar.
Download: http://wordpress.org/extend/plugins/bosslist/