Accessing the site from WebKit nightly on OS X yields the following message: "The browser you are using [AppleMAC-Safari5] is not (yet) supported! Please use Internet Explorer 6.0 or 7.0, Firefox or Chrome." They used to block Chrome as well (http://crbug.com/9492) but seem to have fixed that. Someone should probably contact them and ask them to fix their useragent sniffing code.