This isn't an advertisement or anything... But Google did this contest where you could submit a video of how Gmail *really* works, behind the scenes. And people submitted some really awesome stuff! The whole video has lots of little chunks of awesome videos from all over.
Watch it here.
And if you watch the video, or click on one of the spots in Africa on the map, you can see my roommate, on the top of Mount Kilimanjaro, in a yellow jacket marching with the Gmail M-velope. Coolness.