Add .nyud.net:8090 to the URLs of your images (or any page, more or less static), and your visitors will download it from a worlwide network of proxies, sparing your server’s bandwidth.
It’s that simple. It’s free. It’s magical. Where’s the catch? Why isn’t everybody using it? Will it disappear as soon as everyone learns about it? Why aren’t you using it?
P.S. For a test, click the “via” link above: The Tao of Mac is served by Coral. If it’s not working for you, you’d better say so now, before I switch all my image links.