Some sweet soul has put Powers of Ten online. If you've never seen it, I can't recommend it enough:
Powers of Ten is a short film by Charles and Ray Eames, whose work you may have previously sat in. The film starts on a picnic blanket in Chicago and zooms out 10x every 10 seconds until the entire universe (more or less) is visible. And then they zoom all the way back down into the nucleus of an atom. A timeless classic. (via youngna)
Update: How in the hell did I miss this Powers of Ten Simpsons couch gag? (thx, ray and jeff)