Mark Glaser at MediaShift has an entry that describes some of the more useful podcast directories including iTunes.com, Podcast Alley, Yahoo Podcasts, Odeo and Podcast.net. The number of podcasts has really swelled -- Glaser notes that Yahoo's podcast directory lists over 23,000 podcasts in the news category alone. With so many podcasts you need a good directory that makes it easy to find the podcasts you want by using categories, tags and ranking systems. Glaser gave iTunes the highest mark with an A. Podcast Alley received an A- and Yahoo Podcasts earned a solid B+.
