Got a nasty case of 'IE'?
A very simple console emulation for IE.
Adapted from a script by András Bártházi.
Doesn't quite go as far as Firebug's console, but does provide nicely formatted dumps of objects, arrays, elements, etc.
[UPDATE: Don't bother with this anymore, Joe Hewitt has provided a much better console for IE and other browsers: Firebug Lite]
Add those extra every-so-useful Array methods to lesser browsers.