I explored the three podcast search tools. Here is my take on them:
Podcast.net--the worst of the three. I search for "library" and got about half the hits I had gotten on the other two and none of the podcasts seemed to be from 2007! Thumbs down!
Podcastalley.com--This one had more hits than Podcast.net and recent 'casts. The only think I really didn't like about Podcast alley were the ads. Thumbs up!
Yahoo podcasts: This one had even more hits than Postcast Alley, but it looked like a lot of them were duplicates. I did like the fact that they had ratings for each podcast. Thumbs up!
I downloaded one podcast into my blog from Podcast Alley called LibVibe which looks like a good library-based blog (has library news). Each 'cast is sort of long for my taste, but I realized that I was just sitting there listening rather than listening and doing something else.
The advantage of the podcast over a video is that you can definitely multitask while listening to one rather than just sitting and staring at your computer screen. Podcasts may grow on me for this reason.