TuneIn Radio is a good online radio player that will also do Podcasts. It has both topical indices AND location indices. It will also pick up your location and give you "nearby" stations.
It seems to have some problem picking up some local channels when my DSL is a bit glitchy, but otherwise it's quite good. Interface is very usable if a bit plain. You can also "bookmark" the favorite stations.
If you want to listen to news or music stations without a radio, this is the app to get.
Rating: get it!
http://www.appbrain.com/app/tunein-radio/tunein.player