Hi,
I don't know how many people are affected, but if you haven't got the email from DYN Dns service yet, DLINKDDNS users must "confirm" your account to continue to use the service. You need the user name, password, and the serial number and MAC ID of the Dlink device that qualifies you for the free service. Apparently, this information will have to be verified by Dlink to see that it is a valid Dlink device. If you have changed emails since signing up for the service, you will not get this notice of course, but if you login to Dlinkddns, there is a "confirm account" tab, which I assume will prompt you for the device serial # and MAC ID. If you don't do this, the service will apparently drop you in about 90 days.
There is also some troubling reference to most devices being eligible for only 6 months of free service....not sure what that means at this point, but if this becomes the limit for DLINKDDNS, then I really would like to request a firmware upgrade for most Dlink devices to support a couple more free DDNS providers. Anyone else who has any additional info, please add.