Integrate MyblogU free content with your WordPress blog.
Task management plugin from the authors of TaskFreak!
Lightweight GTD for the P2 WordPress theme.
This WordPress plugin is a complete flexible Projekt Task Management System. It's a very easy to use, but yet a powerful plugin.
Use P2? Use email? Use both!
Create multiple todo lists, one for each post or page if you want.
A plugin that allows you to organize ideas for future blog posts, plugins, anything at all in one simple page under Manage > Ideas.