The segment is available online.  Today it is on the home page.  After today, it will be under "Recent Shows".  Look for the following summary:

"Craigslist and Law Enforcement
The case of Philip Markoff, who is charged with the murder of one woman and robbery of another, has brought up questions about the online marketplace Craigslist. Markoff met both women through their Craigslist ads for erotic services. We speak with Patrick Black, who operates a website that tracks crime on Craigslist, and Massachusetts Attorney General Martha Coakley, who has been weighing how to work with Craigslist on cases like Markoff’s."

Here is the link for the Craigslist crimelist site:
http://crimene.ws/category/craigscrimelist/