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Right now I am using TaskPaper to put my ToDos down. It is simple text based To Do list with the ability to put notes etc. If you used an iPhone you could combine that with Listacular. Sync it over Dropbox and you got yourself a simple and efficient To Do list. If you don't want to use TaskPaper but know to syntax (very easy), just use nvAlt. It is a note taking app that can save files in .txt and just sync them up with dropbox to Listacular. I tried many many many to do lists. It depends on what your needs are. If you have additional questions, shoot :)