Car Talk is celebrating 20 years on NPR, and the self-effacing, often goofy show is now available in iTunes. It's exciting to "play along" and see if you come up with the same answer as brothers Tom and Ray, an now you can do that at your leisure. We have our local NPR station's schedule memorized, but sometimes it's just not possible to catch the show when it airs; throwing a tantrum won't always get you your way. The show certainly has its detractors, and some of the content can tend toward softballs, but the Magliozzis have built vast appeal and recognition, not to mention a little merchandise empire. If you want to hear hearty guffaws and try to solve the puzzler on your time, check out the Car Talk website, or iTunes and subscribe to the feed.