With our featured article on introducing Twitter as a To Do List, Ben Mattes also has similar setup, with an emphasis on using Twitter's SMS feature to setup a SMS todo list:
The great thing with Twitter (as I hinted at above) is that you can add ‘tweets’ via SMS. Once you have created an account and signed in, you need simply connect your phone to your twitter account (do so on the Settings -> Phone & IM page). You’ll receive an SMS from Twitter and from then on adding a ‘tweet’ is as easy as sending an SMS to the twitter number you’ll add to your phonebook.
Note: I personally suggest that you keep your twitter page private (you can do this in the ‘settings’ page) in case you want to send yourself sensitive reminders. There are certain advanced twitter functionalities that do not work with private pages, though, so you’ll have to decide for yourself how sensitive your personal reminders are.
SMS ‘To Do' Lists – [toomuchimagination]