Late last summer, the organizers of an annual convention called TechLearn '99 announced that two of the most famous icons of the 1980s would keynote the event. The first was Bill Cosby, one of the decade's most popular entertainers; the second was Michael R. Milken, the "junk bond king" who became a symbol of the decade's greed when he was sentenced to prison for securities fraud. Until recently, Milken's presence on the stage with Cosby would have seemed like a bizarre joke.