Click and Clack will be on NOVA, presenting their look into the Car of the Future.
A less 'goofy' preview can be found on pbs.org. The show will air on Earth Day, April 22nd at 8 PM on most PBS stations. You might want to check your local listings for any changes in your area.
Update: I admit it, I thought this show was going to be goofier than the preview. But it really was a good overall view of the situation facing the automotive world today. If you missed it, take some time and watch the show in it's entirety. If you want to focus in on hybrids and plug-in hybrids, skip ahead to chapter 5.