Last Updated Jan 22, 2009 11:00 AM EST
Checkvist has all the basic features you need to create checklists and outlines. You can nest items, link notes to specific entries, and mark tasks as complete with a satisfying strikethrough. Checkvist also makes it easy to invite people to collaborate with you on individual checklists. You can create any number of lists, and archive completed ones.
The interface is fairly sparse, but the lack of clutter helps you to focus on building and using your lists -- and there are keyboard shortcuts for everything, so you'll rarely need to reach for the mouse. My only complaint? The name. That V in "Checkvist?" It's an L turned sideways, designed to look like a checkmark.