try clearing cache. on windows machine you can do an 'ipconfig /flushdns' on the command line. I would also recommend emptying your browser cache and starting a new instance of your browser. A reboot would achieve the same affect. If even that fails, it may be simply that your isp hasn't gotten the new dns entries cached yet, and is still using the old cached copy.
I tested on 4 machines, 2 of which were on the same external dns servers. Those 2 failed most likely because their cache hadn't been updated, but the other 2 worked fine, including my home machine. Just give it some time and it will be back. On an aside, wdn.wowinterface.com is forwarding to wdnaddons.com without the www alias. It was a bad thing that it went through 2 redirects in the first place, so hopefully this problem wont happen again. Well, until the url changes (I recently registered wowcompares.com as wdnaddons.com was originally supposed to be my own personal development site, and ended up hosting the compares out of necessity at the time.)