If I am not mistaken, back in '06 (Or was it '05?) the Forum switched servers and -alot- of the posts were lost. If Elfin or Silver were still here (Or somebody of equal length of being here) they could give more detailed information.
But either way, the oldest post is lost to the antiquities of time. (Yea, I know, I'm not admin, but I still thought I'd answer. )
Just FYI, we were originally called Diablo3.com, before we gave the domain to Blizzard. So whatever it is that you're trying to find out, yes, we are the oldest, longest standing Diablo 3 fansite. An official one, at that.