If you haven't already heard about Stitcher, it's pretty cool! This is a service that's free and can stream to a mobile device or a desktop computer. It takes what you like to listen to and suggests similar shows -- sort of like Pandora Radio's "Music Genome Project." There are lots of well-known podcasts like This American Life,  and The Onion's (fake) newscasts, and Stuff You Should Know, as well as more obscure, but related, shows. 

There are podcasts in a variety of languages, on a variety of topics, so there's bound to be something that suits you. Happy listening!