I thought the article was very interesting and funny. Somebody had to say it!
In addition to the underdog fanboy, though, i introduce the conformist. The fanboys for x product told that person that its the best and that everyone uses it, so they decided that they didn't have to think for themselves and that product is indeed the best thing ever. Or the fanboys who love a brand because its products used to be great, even if they aren't any more. Those are the two I've seen more often.
Also, the historian fanboy category you described really reminded me of all those people who still recommend 9800GTX+s as "kickass videocards."
I thought that was definitely the best intro MaxPC's had in a while. Keep 'em coming Will.