[Joel]

As it so happens, OmniGraffle 1.4 for iPad has just been made available for download on the App Store, one of the new features we added is a scrubber at the bottom of the Document Browser for easier navigation from one end of the list to the other.

Depending on your location, the new update may or may not show up just yet, you may have to give it some time to propagate to the servers.