Do Radio Interviews Sell Books?

Has anyone been interviewed on a radio show and seen a spike in their sales, after the interview? I am wondering if the only advantage is exposure and name recognition.

I host a Blog Talk Radio show that I began last summer. The listens have steadily climbed to the thousands by now. I have interviewed authors, both traditionally and self-published, publicists, marketing specialists, and publishers. I will interview our own John Kremer on April 12, 2010.

I would like to have some feedback regarding sales, if you have any. Thanks in advance!

Felice Gerwitz
http://www.InformationInANutshell.com