IE7 totally ign0res css rule
On the right hand side of this page
there is a blue box with an h3 and email link inside it, with a paragraph below it. In FF the h3 is white text, centered, and larger than the paragraph text, as the css states. In IE7 the styles for the h3 are totally ignored, it's identical to plain text.
Menu courtesy of www.cssplay.co.uk - thanks stu.