As I am sure you know, you can go back and forward between web pages by using the arrow buttons on the toolbar. On IE7, there is a shortcut for doing this that can be quite useful.
By holding down the Shift key and using the scroll wheel on your mouse, you can go back and forth in your web browsing history quite quickly.
Holding down the Shift key and scrolling forward with the mouse will move you forward through the web pages.
Holding down the Shift key and scrolling backward will move you back through the web pages.