Ta-da Lists, 37Signals' newest creation, is a free web application that lets you create, share and subscribe to lists of your making.
The most obvious usage would be a "to do" list, but we like some of the less apparent example uses, like "Restaurants to check out," "Movies to see" or "Web sites to visit later." I always get good recommendations at the office I can never remember at home, and my Ta-da list would be available on any computer.
Capturing distracting thoughts floating around in your mind is the basis of many personal producitivity strategies (like David Allen's excellent Getting Things Done). Ta-da Lists is an interesting way to capture your thoughts and track lists.
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Ta-da Lists [37Signals]