Something OmniFocus lets you do, if you want, is clean out completed items from your main database and move them to a separate “archive” database. This makes OmniFocus more efficient — especially on the iOS apps where you’ll notice that a lighter database helps with faster syncing and speedier overall use.
The Sweet Setup
Somehow I forgot to link to this great new site last week. It's a a great website curating the best apps, tips, tricks and features for your Mac or iOS device.
Oh, and this tip for OmniFocus greatly improves the syncing experience on the iPad and iPhone.