If you haven’t discovered them yet – run to your computer, open the iTunes Music Store and click on 'Podcasts.' They are free, entertaining and educational. I subscribe to the Grey’s Anatomy Official Podcast and The Official Lost Podcast, among many others, but there are thousands to choose from in almost every category imaginable: comedy, music, news & politics, sports, etc. I download the daily and weekly updates, news, chats and interviews, add them to my iPod and then listen in the car.  They're great for frequent flyers and pop culture sponges alike.