Great for testing your webpage in past versions of IE.IE6 is still one of the more mainstream browsers according to W3 Counter. It has about a 25% market share, only trumped by IE7 at 31% at the time of this posting. So...how do you test these older browsers when Microsoft will only let you have the latest version of IE installed? Well I came across this awesome product called IE Tester (picture above), which lets you choose which IE rendering engine to use, and simply opens up that browser in a tab. It is definitely very useful for web development, so if you have windows you can grab it here (Oh it's free of course).