I love web sites which demonstrate the incredible power of the internet, and here's one of my favourites at the moment. It's a map of the world which shows every lightning strike, in real time.
If you want to watch storms as they travel across the world, try the site right now. If you want to see just how accurate it is, however, you'll have to wait until there's a storm in your area and then see how the view in your browser compares to the one out of your window.
Beware that watching this very clever feed can become rather addictive! If you're OK with that, head to http://en.blitzortung.org/live_lightning_maps.php and enjoy.