The Daily Show with Jon Stewart and The Colbert Report feature notable authors constantly. If you're looking for a list of all the books from all the guests on either of those programs (going back to 2006), the Daily Show Book List and Colbert Report Book List might be for you. Please note that these are Amazon affiliate marketing pages not associated with the shows in any way [via reddit]. Here are some selections from 2011:

Through my eyes by Tim Tebow with Nathan Whitaker

The savage city: race, murder, and a generation on the edge by T. J. English