Got an extra monitor lying around? Hook it up brainlessly using Windows 7 in literally two steps.
Thanks to the spankin' new Windows shortcuts, all you have to do is physically connect your external monitor through your VGA port or some other port and hit Win+P on your keyboard.
A little pop-up will appear on your desktop and you will be asked to choose between four options:
1. Show destop only on computer display
2. Duplicate desktop onto projector
3. Extend desktop to projector
4. Show desktop only on projector
...and that's all folks. There is something to note, though: if you want your monitor to show a different resolution, you're going to have to manually tweak the resolution yourself. In that case, you'll have to right-click your desktop and go to Screen Resolution. It's, for the most part, simple enough.
(Disclosure: I'm not actually sure how easy it would be for cavemen... maybe I can borrow one from Geico?)