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If you, like me, tend to use logging with Firebug or even alert() quite often when developing JavaScript, you might be interested in Blackbird by G. Scott Olson. Blackbird is a simple utility that does nothing apart from displaying log messages and very basic JavaScript performance testing.

Logging JavaScript with Blackbird

Unlike utilities like Firebug or Venkman, Blackbird isn't a browser add-on but just some JS and CSS that you can add to your projects, therefore it can be used in any browser. The tool even works in IE6, what makes it pretty useful for cross-browser debugging.

You can see the tool in action at the project website, it's also a demo by itself. Nice layout idea btw, incuding the tool itself in the design as title artwork.

If you need more than just logging: Firebug lite simulates some features of Firebug and works the same way Blackbird does.