Cork City is a classic. It doesn't render properly in IE7, Netscape, Opera OR Firefox. I had to dig out IE6 to see it properly.

In fairness, they do say that "site will only operate correctly by using Microsoft Internet Explorer 5.5 or greater". They just forgot to mention that there must be a full moon and there must be a 'z' in the month.

And they advertise that they are Golden Spider winners. Doesn't say much for GS.