2008/8/5 Jonathan Hughes lifebaka@gmail.com:
One thing no-indexing user and user talk namespaces would help with is to curb the recent trend of userpage spam. I see half a dozen or more userpages a day which are spam or masquerading as articles. If userspace wasn't indexed, pretty soon the companies/persons who attempt this sort of advertising will figure out it doesn't work; no one ever finds their "article" from Google or Yahoo.
A lot of these are helpful new-page patrollers moving a spammish article into userspace, FWIW.