Friedman -- THE Friedman, and that means: Milton -- strikes again. He calls for legalizing marijuana (i.e. replacing prohibition with taxation). Here's the story. Here's the list of signatories of a petition led by Friedman -- unlike what the story tells, not all of them are distinguished economists. Only a handful, of which Friedman of course stands out. Talking about this guy, he's just been interviewed here (via MR).
(Somehow I remember my wild idea last year to legalize the now-illegal logging using a strongly enforced tax mechanism)