If you're a jealous Rails dev there's a similar plugin that provides most of the same functionality:

http://github.com/drnic/rails-footnotes/tree/master

Here's an awesome, low-contrast-so-it's-easy-on-the-eyes screenshot:

http://marcusvorwaller.com/look/footnotes-20080920-221131.jp...

Just a heads up anyone using this - the middleware injects the text into the body tag. So, properly formed html with a body is required for the bar to get injected.

So, for anyone like me trying to test this with a response just dumping some test text...hopefully I saved you some debugging time.

After watching that talk - I was actually inspired to build this same thing.

Well done and thanks - this is going to be quite handy.