Not sure if "The Betrayal of the American Right" has anything about Reagan or not. Haven't gotten around to ordering that one yet.
-- Reagan was a collosal disaster for libertarianism. Stole much of the rhetoric and talking points, blew the wind out of the sails of the movement that was exploding in the 70s, and then implemented a wholly Statist agenda. He basically co-opted the movement. It took until Ron Paul to really get the snowball rolling for libertarianism once again.