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Org-Mode is for keeping notes, maintaining ToDo lists, doing project planning, and authoring with a fast and effective plain-text system. http://orgmode.org/

There's also an iPhone app for interfacing with Org-Mode, MobileOrg: http://mobileorg.ncogni.to/

Note: Unfortunately, the Dropbox integration is currently kinda borked, sometimes displaying the password in the clear, or with connection failures.

Although I upvoted 'vi TODO.txt', may I also recommend TaskWarrior (command line task management)? http://taskwarrior.org/wiki/taskwarrior/Gallery

vi TODO.txt