You may get a podcast from the content provider's website such as Twit Network (twit.tv), from a podcast directory such as netcastia.com, or via a media management application with access to a store such as zune software or iTunes.
Because Apple has not fixed the bug. They probably won't. There are problems with the hierarchy. Apple knows about the problems. It just isn't fiscally prudent to spend resources on fixing those...
Podcasts are freely available audio files in several categories including radio show highlights, radio news stories, science discussions, personal health and a whole range of other topics.
Podcasts are generally like radio talk shows but on the internet. They can be about almost any subject you are interested in. Some podcasters are broadcast professionals, celebrities, super fans or...