IE7 has a nice thumb view list of all your currently open tabs.

That's it there, right next to the first tab. Click on it or type Ctrl + Q

to give you this - a thumbnail of each of the sites you have open. Simply click on the thumbnail you wish to switch to.

To obvious you say? Yep, but after using IE7 for ages, I only just noticed it a little while back. So, as usual it sits under the 'well duh' terms of my Disclaimer.

On a related topic - IE7 - I liked Jeff's post today on browser shortcuts. The only thing I'd add is that using IE7Pro allows you to open a new tab from the address bar when you press Enter - ie you don't have to use Alt + Enter.