The designer and blogger Tina Roth Eisenberg has come up with a neat little to-do service with a cute name: TeuxDeux. She has pared this free offering back to the absolute essentials of to-do-ness: seven days viewed at once, a list below, order or day of task changed by drag and drop, click twice to finalise a task, click little cross to delete. Future tasks are black, past are grey and present tasks are red. And that's it. It works. One might wish for additional features and email > task capabilities, but any additional features would tend to muddy what is a very clean interface.