[abh19]

Which version of OmniFocus are you using? Version 1.5 has a pre-made "Due" button in the toolbar.

First, go to planning mode and make sure you are not "focusing" on anything (there is a focus/show all button in the toolbar). Then switch to context mode, click "View" in the toolbar to show the view options, and from left to right, make them say:

Remaining
Due
Due
Next Action (or Due Soon)
Any Duration
Any Flag State

Does that help?