USA.gov podcast directory
USA.gov has a directory of U.S. Government podcasts. The whole site is a directory of government resources, of the U.S. government, plus state and local governments and agencies. It appears the site as a whole is a tremendous resource for us citizens to get access to information published by our employees, the government.
The links in their directory go to the site or feed in question. They don't try to copy to their site any information from the sites they index. They're just operating an index.
Suggest-A-Link is the way to add your listing to the USA.gov directory. Clearly they're going to screen submissions so they are from government agencies.