xkcd. I saw this drawing of "the observable universe from top to bottom" ("Height") a long time ago and have always wanted to blog something about it. So here it is. Be sure to click the small image and scroll to examine all the funny bits visible at full scale. Heights above the Earth's surface are accurate on a log scale. You can also buy a poster of this from the artist.
P.S. Looks like I wrote about this in 2008 too. Oops. It's cool enough to blog twice.