First of all, it’s impossible to install Internet Explorer 7 on Windows 7 unless you use Win XP compatibility mode. You may also experience problems in Vista or XP if you’re already running IE8.
However, there is a very simple way which works in most of the cases if you’re interested in seeing the differences in rendering of HTML and CSS. It may not work 100% but seemed to work fine for me, see the image below – explains everything.
Well… it doesn’t explain the fact why IE7 and IE8 render pages differently in the first place.

FireFound is hands down the best security add-on for Firefox. It is a recently launched add-on which can track the location of your laptop if lost or stolen. It shows you the approximate geolocation along with the WiFi Network it last connected to.
Here’s the plugin homepage or just download it from here.
If this is boring for you, lingerie with GPS tracking is a good alternative.
P.S. We have donated the suggested $0.99!