Debugging Javascript with Blackbird

Talking about JavaScript, if you're the kind of developer that is tired of using "alert()" when you're developing a script, you'll be pleased to know you'll soon never have to do it again.Let me introduce you to Blackbird.

This open-source JavaScript message logger will allow you to easily check what's going on behind-the-scenes in your javascripts.
It won't substitute a full-fledged debugger like Firebug, but it will certainly save you a lot of time tracking down what's going wrong.

(And you won't need to install anything on your computer or browser to use it.)