CSSVista: Live CSS editing with Internet Explorer and Firefox simultaneously
CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously.
This is an incredibely useful tool for any designer. If you’ve ever used the CSS edit (or Web Developer) extensions in Firefox then you know how useful live CSS editing is. This program enables that same useful feature fore Internet Explorer as well.
Wandering the Interwebs 