NPR just released their new iPhone app (built by Pass Time Software).  Now you can listen to Car Talk and All things considered and On the Media on the go.   OK, yes NPR had a perfectly good WebApp that has most of the same functionality but Apps are the new black..  Also, for your laggards on 2.1 or below, you won't be able to install this until you get around to updating.

There should be an app update within a week, which will make the station finder and podcasts available according to the developer

Get it here (iTunes link)

On a related note, you can hear NPR's Macworld predictions here.  Screenshots below.