A personal version of Basecamp, the well-loved project management system for businesses, is out now for $US25. Project management software sounds boring, but it's also crucial to, like, getting anything done, so this is nice for those who have personal side projects.
The $US25 is a one-time fee, and it's a lot cheaper than the business version, but you'll have to cough up another $US25 if you want to start a second project using the personal version. For now, it's only available to current Basecamp users, but 37signals' site implies that will change after a few months. [37signals]