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iPodderx ***DEAD

iPodderX is a podcast client and newsreader that contains a large directory of podcasts. To browse the directory, click on Podcast Directory and then select the category. The results lists the number of podcasts for the category with a brief description of each. Click on the podcast's title to go to its site.
iPodderX software is available for the Mac OS X 10.3.5 or later and Windows XP with service pack 2. For Mac users, having iTunes 4 or later installed is required. For Windows, having Windows Media Player is required and iTunes 4 or later is optional. You can try it free for 30 days. It costs $24.95 and the site has a developer's weblog and a support forum for discussing the application. Downloading the software isn't required to browse or search the directory.
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The Internet Archive

You may know this site as the Wayback Machine. It is an Internet library that contains past and present collections of almost anything available in digital media format. While it's best known for storing Web sites, it also has audio and videos.
Search for podcasts by selecting Audio from the Media Types drop-down next to the search box and enter "podcast" into the search box. Sort search results by relevance, ratings, date or date added. You can also group results and refine your search as there are over 2500 results for podcast. After selecting a podcast, the detail page provides a description, URLs for the site and fed and other relevant information.
Contributing your podcast feed to The Internet Archive requires free registration. After you've registered, click on "recording" under Audio: Upload your own recording. There are several ways to do it and the page explains how.
Ourmedia

http://ourmedia.org/
Ourmedia is a community for discussing home-brew media, sharing and storing works on the site for free and read the group blog for the goings-on. There are groups and neighborhoods. You can browse by media type, which includes video, audio, text and images. To find podcasts, enter "podcast" into the search box.
Each program's detailed page lists the author, location, home page, tags, link to feed and other details. The entry also indicates whether or not you can share and use the work. Registered users can have their own page, publish media, check messages and view the buddy list. The site is often busy, so you may have to wait a bit for things to load.
Submit your podcast here: http://ourmedia.org/publish
Open Media Network

http://www.omn.org/
Open Media Network is a service that provides a selection of movies, public TV and radio, video blogs and podcasts through its free Windows-based application. The OMN Program Guide application lets you use tags for organizing and finding programs, read user reviews and comments, check parental guidance ratings, sync programs with iTunes or Windows Media Player and browse and search for programs.
The site has a community forum for discussing the software plus one forum for producers who publish feeds and another for users. If you wish to search its feeds, it requires downloading the software. The only thing you can do on the site without the software is submit feeds and join the forums.
Submit your podcast here: http://www.omn.org/submitfeeds.htm
Update on July 2009: The service is not more available.
Podscope

http://www.podscope.com/
Podscope is the first and only search engine that creates a Spoken Word Index™ for the entire content of podcasts – enabling the user to find the exact content of interest– the technology is also applicable to video blogs and personal videos.
Podscope crawls the web looking for podcasts and creates an index of every word, thereby making the contents searchable. The user can search a term, generate a list of results ranked using different methods to find the most relevant podcast and click to play or click to download.
Submit your podcast here: http://www.podscope.com/submiturl.php