It's working again.
If you click my link above, then on DNS-321 1TB, look at the firmware 3.0 date.
I would not rely on that date. All of the documents on the page are dated 10/6/2010, including the older versions of the firmware, drivers, documentation, etc. I'm sure that date was related to when the files were linked to the site, not when they were released.
If you download the DNS-321 firmware v1.01 file from the new website, unpack the zip file, and open the properties of the firmware file, you will see that the last modification date of the firmware is 2008.