I have seen and used many of them. But TeuxDeux beats them all.
TuexDeux is a free, web based app (although they have disclosed that they might charge for the service eventually) for managing your to-do lists.
The app has 7 columns for 7 days of the week, and an input box underneath each day. You enter the list of tasks you want to complete into the input box and hit enter. The task appears in the list for that day. When you complete a task, you just click the note and it will cross-out the text.
You also have the ability to fully remove the crossed out text from the list, or move tasks around to other days of the week.
There is one more column at the bottom of the app named “Some Day” where you can enter a task you want to complete well someday. Pretty nifty.
This app is simple, functional and awesome.



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That is a really simple program, and that is exactly what a to-do list should be!
Thanks for the mention! I like this app better than Remember the Milk. It’s my new home page at work now. :)