I, too, am one of those that don't know my books of the bible and can never find the passage in time.
Incidentally, my church recently switched to using a (Mac based) worship presentation package called ProPresenter to handle all of the on-screen slides, instead of PowerPoint. We love it. One of the features is the ability to quickly look up scripture passages and create slides out of them to display on the screen. As one of the A/V guys, it is great fun to play with. A speaker will mention a passage, impromptu, and be very surprised when the verse is on-screen just seconds later!