Search through the members list by date joined and count. Just remember, its 40 names per page, so if you aren't on the first page, its past 40, not on the 2nd, past 80, etc...I was the 198th person to join. I joined in May, a little before E3. (Though I've been lurking on this site since the fourm started.)
762, you joined (as B-Rod) in mid july, as the 421st person to join this fourm.