HowToFoldSoup

Check out the Cell Size and Scale comparison tool from the Genetic Science Center 

Though I've seen similar demonstrations of scale, they've always been cosmological.  The Genetic Science Center at the University of Utah is hosting (and I imagine, created) this simple but very cool flash app that shows the relative size of things in the micro-scale.

 Cool stuff guys. 

[Update:  I've looked around their site a little more and come to the conclusion that this size and scale tool is just the tip of the iceberg.    Compared to the Interactive Cell, Vesicle Logistics Breakdown,  the Fight or Flight cellular response animation, or any of the other amazing articles they have on their Amazing Cells segment of their site, it's only semi-cool.  Everything is beautifully illustrated and explained.]