In my case, I've been a guest on the show three times previously, most notably in August 2007 with "Interview with a VoIP Hacker" where we interviewed Robert Moore shortly before he was heading to prison.
Moore was part of the VoIP fraud case masterminded by Edwin Pena and discussed on another Telecom Junkies episode back in July 2006. I was also on another Junkies episode in November 2007 about VLAN Hopping.
In this 101st episode recorded this week I gave a brief update on the Pena/Moore case (Pena recently pled guilty) and then talked about VoIP and Unified Communication security issues. It was literally just a few minutes, but I was glad to join briefly and help Telecom Junkies celebrate. 100 podcast episodes is indeed a milestone to celebrate! Congrats!