Why RTM?
Remember the Milk is the most efficient, easy-to-learn, well-integrated, and widely recognized to-do app I’ve ever seen. There is an applet for the Linux dock, AWN, a plugin for GMail, several Mac Dashboard widgets, etc., etc. All of this stuff works fine with the free RTM, mind you. It’s the Android/iPhone/Blackberry/WinMo apps that require a paid account.
My favorite feature on Android is the widget:

Google Calendar widget (left) sitting next to the official RTM widget
Tapping the RTM widget shown above launches a functional, super-simple interface for adding and checking off your tasks:

Compare this to what I consider to be RTM’s leading competitor, the free app, Astrid.
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