I'll be doing a rather non-linear presentation (more of a Q&A) where I'll need to pull up arbitrary slides from a long presentation. The fastest way I can jump from one slide to another is to use the Slide Sorter (View -> Slide Sorter in PowerPoint 2007).
In single-screen mode (or duplicate display), I can click on a slide in Slide Sorter, then press Shift+F5 to display it full-screen. Fantastic, just what I need.
Now how can I do that when a projector is connected, so that on my laptop's screen I see the Slide Sorter, but the audience only sees the slide I selected, full-screen?