Lonesome EJ and Alice: His start was waaaaay before he was on CNN. The politicalarticles.net story jumps around Beck's timeline a lot; for a more chronological order, try this Wikipedia article.

It was when Glenn Beck's radio program (entitled "The Glenn Beck Program", oddly enough) changed from a local show in Tampa to a nationally-syndicated program launched by Premiere Radio in 2002 that Beck started broadcasting from Philadelphia, PA. As I said before, his format was mainly of the funny-goofy ilk at first, with commentary on local Philly stories as well as national news and the occasional wacky-news story. But gradually Beck got more preachy and started walking farther and farther out on that right wing.

In 2006 he began his show on CNN, and at first he commuted from doing his 9:00am to noon show at the Philly flagship radio station (WPHT 1210 AM) to New York City for his CNN show at 7:00pm. He couldn't keep up that pace for long, so he moved the flagship location to New York City for his radio show. I don't remember exactly when he said his goodbyes to Philly, but for a short while afterward Beck would chat for a bit with Michael Smerconish during his show (6-9 am) as a preview to Beck's show. Smerconish, as some may know, is a moderate Republican (who voted for Obama!), and often his exchanges with Beck got quite heated! Sometimes Beck would start his show obviously still perturbed at Smerconish!! WPHT quietly phased out the chat segment -- at whose behest (Smerconish's, Beck's, or Premiere Radio's) I don't know!

Side note: Now Michael Smerconish is syndicated, but so far it sseems he has no plans to leave Philly for the bright lights of NYC. Often he appears on the Today Show (a 7-9am TV program) as a commentator and, when he does, he is interviewed remotely from his radio studio in Philadelphia. He and his sidekicks always describe the camera crew's setup and breakdown procedures for the benefit of the radio audience, to explain the momentary awkwardness to be heard in the broadcast.

Note: All times described are Eastern (US) Time, a.k.a. Mudcat Time.