[whpalmer4]

Use the Forecast view + Flags + a perspective (only needed when on iPhone).

On the iPad, the Forecast view gives you items due and starting for the week starting today. As of this writing, the iPod touch/iPhone version doesn't yet have the display of items starting, though I'm sure it is coming. In the mean time, you can build a context mode perspective on the Mac that groups by start date. The perspective will be synced to your iPhone and you can use it to identify actions starting this week.

Use the flags to mark items which you want to work this week even if they aren't starting or due in this time frame. If you flag a project, all of its actions are treated as if they are flagged, or you can flag individual actions if you prefer.

So, workflow looks like:

Open OmniFocus, work all items due today (or before today!). Spend remaining time working items on flagged list, starting today, or due (or starting) later in week. If all lists exhausted, go to context view, pick a context in which you could work, and have at it.