It's too late, but Howie Mandel was a guest on Penn Jillette's radio show today. Also, host-to-be Bob Saget (the illest m**********r in a cardigan sweater) will be Penn's guest on Friday.
Never fear...you can download the show the next day (so Mandel will be posted on Thursday). However, be prepared fan boys because Penn referred to Howie as hosting "that stupid show."
http://www.pennradio.com to download previous shows and info on where you can hear Penn on the radio live.