The Monkey Buddha Archives:
I recently came across an even more expansive chart, comparing the sizes of a large number of sci-fi spaceships, from such stories as Star Wars, Star Trek, and even games like Halo & Deadspace.
It is an awesome reference guide to the endless possible ways that we can travel among the stars!
The chart was made by DeviantART user, DirkLoechel:
Click for a hi-res view: