I suddenly realised today that it is nearly a year since I started blogging. Checking the archives, I find that the actual date of the first post was 6 April 2006. So this year, that will be, let me see, err, oh dear, Good Friday. So no champagne celebrations then.
Looking up an almanac of moveable feasts, I see that 6 April will not fall on Easter Sunday until 2053. Not likely I will live until then.
BTW I checked google for "blogiversary" (442,000 hits) and "blogniversary" (477 hits) so have unthinkingly gone along with the majority view. It's nice to be able to do that occasionally :-)