Originally Posted by Janszoon

The biggest problem with Explorer is that it's by far the least compliant with web standards out of all the major browsers. That's crappy in and of itself but also, because it comes free with the world's most popular operating system, it's very widely used and that means the code for most sites has to be filled with hacks just to accommodate this poorly-designed browser.

Firefox is really the way to go. I believe it's the most compliant or one of the most compliant of all browsers.