These are some great ideas, I think I may use Twitter a lot more after this.
Lifehack.org has written up a useful article on how to use the insanely addictive mini-blogging tool Twitter.

Twitter as a Newsletter.
Twitter for Business Management.
Twitter for People Management.
Twitter as a ToDo List.

Also take a look at EVOCA http://www.evoca.com/ to use as a voice reminder or a voice ToDoList.

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