Add Instapaper-style footnotes to your site with Bigfoot

Bigfoot is a nifty jQuery plugin that:

automatically detects the footnote link and content, turns the link into an easy-to-click button, and puts up a popover when the reader clicks on the footnote button

I installed Bigfoot on my blog and it Just Worked, which puts it in my Pantheon of awesome jQuery plugins. See it in action here and be sure to check out the sweet demo where you can try different styles.