Not too long ago, Craig Ballantyne (creator of Turbulence Training) interviewed Tony Horton, and posted a link to the audio here.
I quickly lost count of the celebrities that Tony name-checked (Tom Petty! Pink! Annie Lennox! Billy Idol! Ashton Kutcher! Usher!), but overall, Tony comes across as thoughtful, well-spoken, inspirational, and thoroughly un-douchey. He discusses how he got into personal training, how he transitioned into making home fitness videos, and his fitness and diet regimen. It's good stuff. (Really.)
(More about Turbulence Training from The Fitness Black Book here, and more about Craig Ballantyne here.)