Add mouse gestures to IE by downloading and installing the plugin on this page. Requires free registration. I've been the using the plugin for about 6 months now with no conflicts or problems. Nice quick download - it's about time we got this for IE!
For those of you not familiar with mouse gestures, they enable web navigation using the appropriate swipe of the mouse in conjuction with the right mouse button (I'm not sure about compatibility with Macs).
Once you're comfortable with mouse gestures and start using them regularly, you'll notice dramatically increased web browsing. It actually gets annoying if you ever switch back to a browser without gestures because you end up relying on it so much! Very intuitive and a great plugin!