I started listening to the This Week in Photography (TWiP) podcast (episode 65) on my way in to work this morning. Over seven minutes into a one hour and 20 minute episode, and they hadn't really started talking about photography. So I skipped ahead to the next podcast in my playlist.
I much prefer the Tack Sharp podcast. The average length of the episodes is about 20 minutes, and each episode focuses on one subject only. I've learned something from every one of the six episodes so far.
Alex Lindsay and Scott Bourne, the founders and two of the regulars on TWiP are also regulars on MacBreak Weekly (MBW). So it's understandable that the style and format of their podcast is very similar. (They even have "picks of the week".) But what makes MBW (and TWiT) worth listening to (even when they rat-hole or ramble--although I'm often tempted to skip them when they're particularly long--the last MBW was just sort of two hours) is that I feel like I've gotten to know the personalities so each week feels like listening to old friends. (And Leo Laporte does a great job of keeping both podcasts interesting.) Perhaps if I kept listening to TWiP I'd get that same comfortable familiarity with it, but I only have so much time.
The TWIPPHOTO.COM blog has excellent show notes for the episodes, and there's plenty of other material there worth reading. So I'll probably favor their blog over their podcast. (But I find it harder to make time for blog reading than podcasts.)