I can tell you that one reason some people have disappeared is because their employers cut off access to the general Internet at work so employees can't goof off and those people don't have Internet access at home. (One of the biggest contributors to these boards, CallieWL, was in that situation when she disappeared.) And of course others probably just outgrew us and/or posting on message boards in general. I believe someone once posted with regard to Sara Monster that her DS Web site hasn't been updated in almost two years.