In 2000, Arneson completed work on a documentary called Dragons In The Basement. The documentary is about the genesis of role playing, and includes interviews with Gygax and other early founders. It's uncertain if it's aired (beyond a showing at Gen Con 2000), although Arneson is looking to sell it to PBS or Sci Fi. You can see a preview at his web site.
Arneson generally occupies his time these days lecturing at role playing conventions and teaching sailing at a private university in Florida. To this day Arneson still runs his original Blackmoor campaign.
that site you mentioned wrote:After a great deal of discussion . . . yes let us call it "discussion" the culprit promised to make amends. He, and his associate did. The next time the orcs attacked the two opened the door and let the Orcs in. They shared the loot and fled North to the lands of the EGG OF COOT. (Sigh)