This question is more targeted to iPhone and/or Macintosh users, but what do you use for productivity? What reminds you to write a few articles for Ezine, or what reminds you to set up that new website? Do you use the powerful, yet expensive OmniFocus, or do you use Things on your iPhone? I personally am not using one at this moment, that's why I started this thread. I kind of want suggestions to help me organize what I need to do.