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There used to be an OmniFocus dashboard widget called OmniFidget that did pretty much exactly what you ask. Unfortunately, it has joined the great software scrap heap in the sky...

Here's a radical suggestion: Put OmniFocus in context view. Close your eyes. Move the mouse somewhere on the sidebar and click on a context. Open your eyes. Do the first thing listed in that context, or pick another context in the same way. You don't really need software to do this for you, it just makes it more likely you'll play with the tool instead of actually doing something. I know all about this problem :-)