I do a lot of web development and constantly switch back and forth between browers to make sure that sites look the same. Since I run Windows 7 my choice of what version of Internet Explorer I can use is limited to IE8. However it turns out that there is a very nice set of developers tool in IE8 that is accessible by pressing the F12 key (or going to Tools – Developer Tools). It is very easy to switch between IE7 and IE8.