Sounds like the work of a lone nitwit with too much time on his hands.

I don't have the cite, but the original Conservapedia group was, in fact 40 or so home-schooled high-school students (maybe college? I don't remember). It has grown (according to them) since then.

But yes, it sounds like a lone nut.

Andrew Sullivan flags this entry about cacti as a particularly choice example. It reads almost like parody to me, like something Colbert would write.

I've read in a few places that Conservapedia (which has hit all the blogs) may be having some issues with parody. Since it's a Wiki, anyone can modify it, and some on the left have made a few changes to make the original entries seem more "wingnutty." Thus, the humorus cactus entry.