So what's the deal with IE6? What was so special about it? I don't understand.
It's special because it won't go away. It came out in 2001 and people still use it to this day. IE basically owned the market back then and Microsoft just sat back and let it stagnate. They didn't release IE7 until years later and only because they suddenly had competition from Firefox. Their pure laziness and greed stuck the world with a proprietary outdated browser with terrible standards compliance for nearly a decade. IE is only now becoming a good browser again, but its reputation is so badly tarnished that it may be too late to save it.