I was just pointed to the iPad app Priority Matrix [opens in iTunes], which allows you to visually organize tasks into the four quadrants of urgent and important, urgent but not important, important but not urgent, and not important and not urgent.
I was pleasantly surprised by the program. I like being able to see tasks visually separated in this way, and the program is very easy to use. I see some potential here for possibly keeping my daily list, since the OmniFocus interface has not yet been adapted to the iPad.
Here’s a video showing how it works: