Can I archive automatically?
 

I just discovered I have to archive old and completed items manually. Is there a way to set it up so that OF will automatically any completed items over x days old?

There's a feature request open on an auto-archive feature, but at the moment there are other requests in the database with more customer votes attached. If you email the [EMAIL="omnifocus@omnigroup.com"]support ninjas[/EMAIL], they can vote that request up on your behalf.