This one is an interactive one that gives some other good comparisons. Been around for a while but it does put things in perspective from the smallest to the largest of all known objects..
Scale of the Universe 2
Edit: Use your mouse wheel (if you have one) to scroll in and out. Otherwise use the slider bar on the bottom of the graphic.
edit on 15-2-2013 by ownbestenemy because: (no reason given)