I like the simplicity though. No need to make it busy and bloated. Most browsers already have a Firebug or something on them already (or you can add them yourself). No reason to have two.
I agree that there isn't a need to reinvent the wheel, but using it I find myself wanting some firebug-esq capabilities. I ended up just firing up inspector in Chrome, but there may be an opportunity here.
Or integrating something like that could ruin the simplicity of the app.
