Run IE versions side by side

"PIE makes Internet Explorer 6-8 capable of rendering several of the most useful CSS3 decoration features."

You can't style <noscript> with a border or background colour, otherwise IE8 will show a 'ghost' - a small square with the background colour/border around it. The solution: put a div inside the noscript tag and style that. Ugh.

Plugin for jQuery providing native support for missing CSS in IE.

If you're using HTML5, it might be a good idea to explain why your site looks a mess to visitors using IE with JavaScript switched off.

Run various versions of Internet Explorer on OS X.