"Terry O'Reilly is back exploring the countless ways marketers permeate your life, from media, art, and language, to politics, religion, and fashion."I highly recommend this show... there's some pretty fascinating stuff on it! It will definitely open your eyes to how advertising works (or doesn't), and how it sneaks in places you don't expect.
Speaking of CBC shows, I also highly recommend Spark, As It Happens, Ideas, Quirks and Quarks, Vinyl Cafe, and And The Winner Is. I've recently subscribed to Tapestry, The Next Chapter, "White Coat, Black Art" (I used quotes because of the comma in that title), and Definitely Not The Opera ("DNTO"), since I've enjoyed them when I happen to catch them on the radio. I also really like Revision Quest, but it doesn't seem to have a podcast. :(
Here's a link to CBC's podcasting page, which has links to all of the above official podcasts.