It's the second podcast from Sam Glover and Aaron Street at Lawyerist: "Podcast #2: Paul Floyd on How to Value and Sell a Law Practice." According to Glover, "Among other things, Paul helps lawyers sell their practices, and I wanted to talk to Paul about valuing a practice because I felt like I never got a straight answer when I have asked how to do it."
It's a very interesting interview, which you will enjoy even if you aren't selling a practice. I know I did, especially Floyd's comments about personal-injury firms. I learned a number of things I didn't know.
The podcast also includes a discussion of this question: How do you calculate flat fees when starting out? A great second podcast from Lawyerist.