Online
Zoho is a cloud-based solutions provider that's been around for quite a while, even before they started calling online tools "cloud-based" or "software as a service," even though that's what these tools were.
I have run into Zoho before, when looking at online office suites, and while I liked the feature set of Zoho Office, I don't remember being entirely thrilled with the speed and usability.
Those reservations aren't held for Zoho Projects, which has an easy-to-use and snappy interface that delivers quite a bit of project management tools.
The entire tool set is built with full-scale project management in mind, with project management and creation that's easy to do, and task management that's clear, too. I liked that you could not only assign tasks within a given project, but you could also create tasklists within projects -- a nice little organization tool.