Have you heard of WindizUpdate? It is designed to provide an alternative to Windows Update which will run in Firefox, Netscape or Opera. I guess you know what this means, the final obstacle from being 100% IE free has just been knocked down, you can use Firefox to get your Windows updates!
When Firefox arrives at the Windows Update (TM) page, this extension will automagically redirect you to WindizUpdate. Thus you will no longer need to tolerate the "You must downgrade to IE" message that Windoze Update gives you.
Oh, and Ive thrown in a WindizUpdate option into the Tools menu, so you can access WindizUpdate easily at any time. ;)