Yes, actually. Incredibly useful is an understatement, considering that before this wonderful little product, the only way we web developers could test various

Yes, actually. Incredibly useful is an understatement, considering that before this wonderful little product, the only way we web developers could test various versions of IE and various versions other browsers, was to have countless virtual machines wasting tremendous amounts of hard drive space, and sucking up gobs of our precious time as we waited for the VM's to boot just to properly test a site.