Test your javascript code online

Some time ago thanks to an answer at StackOverflow I discovered an amazing web service called jsfiddle. Basically it allows you to test your JavaScript code online with the option to make use of some of the most popular frameworks out there (like jQuery, Mootools, YUI, Dojo, etc..), and if you need so, you can share your "fiddles" too.

An excellent tool that always come handy.