In the interest of my users I like to try and keep IE usable for them if I can so I have been trying Finjan SurfinGuard Pro. This program runs IE in a sandbox allegedly though I have seen no cat poo while surfing the net. It makes some nice train noises wooo wooo and blocks any active content from running - as a bonus it displays a lifesaver in the system tray, who could ask for more.
Downloaded content can also be run in the sandbox, it works OK for me so far so I wonder if anyone else out there has experience with it.
Take a peek - http://www.finjan.com/products/HomeUsersSurfinGuardPro/