Anti-Internet Explorer Site Code
Everyone loves to hate Internet Explorer. Microsoft was originally late to the browser game, but eventually won out over other browsers. Think of that what you may, but I have to admit that the competition at the time was made up of some pretty crappy browsers. It wasn't until the battle was pretty much lost that the alternatives started getting interesting.
The IE folks sat on the browser for a while giving time for a real competitor: FireFox to come into being. FireFox is a pretty good browser and is very developer-friendly. It's far from perfect though.
That all said, someone needs to update their site code and FUD text. It doesn't even take into account advancements in IE7, which has been out for some time. I use Firefox as well, but not as my default browser and crap like what you see below just gets under my skin.
Part of being a good citizen site on the net is respecting the user's choice in browser: that means supporting IE, FireFox and Safari (and of course Opera and other common browsers), but it also means not doing obnoxious things like popping up "your browser sucks" messages on the page and forcing an extra navigation step because you have some sort of an agenda.

After all that, the site works just fine in IE7 even though it is pretty butt-ugly in any browser :)