If you haven't been reading On Rad's Radar, you should. This TMC blog is written by Peter Radizeski the CEO of Rad-Info, Inc. Let me take an excerpt from his bio.

"Today, I am still an agent for about 20 carriers (all through other master agents), but I spend more time consulting for service providers (ISP, WISP, CLEC, MSO, FTTH, and ITSP) on strategy, marketing, messaging, and sales training. I also spend a good deal of time blogging here at TMC and other places. Thanks for reading!"

Peter also speaks and moderates sessions at Internet Telephony Conference & Expo. Peter knows the VoIP/telecom industry very well and has great insights. He's especially knowledgeable in the wireless industry. I've had some great conversations with Peter in the ITEXPO press room about various industry topics. He's not as prolific a blogger as me , but when he does write, it's good stuff! So add him to your RSS reader - you won't be disappointed.