Remember way back when the IRB applet was first thrust upon the world, and I promised that you truly could now use Ruby in the browser? At the time, it was still a little cumbersome, and generally you could only use Ruby by passing it directly into the applet.

Well Dion Almaer has taken it to the next awesome step:

<script type="text/ruby">

Check out his blog entry on how to enable true Ruby scripting on the client side, as well as the link to his demo page (still loads up the applet in the background, but that's a minor implementation detail).

Awesome.