I've always struglled by not finding something equivalent to firebug to internet explorer, but today, I've found webDevHelper:
http://projects.nikhilk.net/Projects/WebDevHelper.aspx

xmlHttpRequests inspection, dom inspector, javascript debugger, it's all I ever wanted to find for ie.

I'm sharing this with you guys, hoping that it will be helpful to you too.

Looks nice and very helpful

Or, use the Developer Toolbar from MS - has a DOM explorer that's extremely helpful. http://blogs.msdn.com/ie/archive/2005/09/16/469686.aspx
Works for IE 6 and IE 6.

yes, but this toolbar is for debugging.

The MS toolbar is so oriented to help the analyze of the structure of a page, that's it's almost useless for anything else.
What I liked in this one, is that everything is kept under one hood.

No more ms script debugger (which crash every 2 launches) nor crappy alert() calls in js.
Yay !

that's it's almost useless for anything else.

Not at all, far from it ! If you've got a CSS problem, the IE Dev Toolbar can be a lifesaver.

If you're not doing any scripting, then the DOM inspector is enough.

Yes, that's what I meant.

I'm doing 95% javascript/php/xml programmation. I need more a javascript debugger than a dom inspector.

In that view, the ms toolbar is useless to me.

A life saver indeed, thank you!