Thank you to Nexxtepion Terry Belanger for telling me about ReQall! ReQall is an excellent tool for the absent-minded, forgetful, and for those who are just plain busy! The tool allows you to create reminders via phone call, voice recording, text, instant message, and email (to name a few). Then, ReQall organizes your reminders by date, time, topic and even location for those using iPhones or BlackBerry with GPS. All of these services are included with the free version of ReQall.
The best explanation I found for ReQall is in this video, "See How David Pogue Uses ReQall" (it's silly, but informative): http://www.reqall.com/about/how_to_videos
The ReQall website is http://www.reqall.com