NowDoThis
I don't much care for many of the fancy online to-do list managers. In my opinion, they are overloaded with features that take away from the basic purpose: to help you actually get stuff done. That's why I like NowDoThis, which takes a super-simple, minimalist approach to to-do list management. Unlike most web apps, there is no need to create an account. Just edit your list of tasks and NowDoThis displays them one-by-one, starting with the first task on your list. When you finish, click "done" and your next task will be displayed. In addition to its simplicity, it also helps to keep you focused by encouraging you to concentrate on one task at a time. Read about updates to the site at the NowDoThis blog.
