Atlanta radio talk show host Neal Boortz (Boortz.com) is syndicated to about 260 stations around the country, and he's openly Libertarian - and spoke at their convention this summer.
He does break with many Libertarians who are anti-Iraq war, but he is supporting Bush (since not voting is like voting for Kerry.)
Boortz is live from 9:00 - noon eastern time. Try
www.wsbradio.com to listen.