I always enjoy listening to Car Talk on the radio. I think it's wonderful that it is possible to have a show with such broad appeal on such a technical subject. I suspect that most people who actually know a lot about cars find it annoyingly simplistic and inaccurate but probably still enjoy the jokes.
I wonder if it would be possible to do a similarly broadly-appealing show about computers? I guess the closest thing I've seen was Call for help on the old TechTV but I think that was both too geeky (and not funny enough) to have broad appeal, and also too simplistic to be of interest to real geeks. Being on TV instead of the radio probably didn't help either - if you're watching a TV show it's much more difficult to do something else at the same time than if you're listening to the radio so you're only going to watch if you're particularly interested, not if you're just a casual computer user.
I think a car-talk-style show about computers would be great fun to do. It would include all the jokes, banter and puzzles that we enjoy on Car Talk, and also help normal, non-geeky people with their computer problems. Sure you'd get a lot of calls just consisting of "Help! My computer has spyware!" but the Car Talk guys get a lot of calls just consisting of "Help! My car is making a funny noise/smell!" and somehow they always manage to make it interesting so I'm sure it's possible.
Perhaps it is just an idea whose time has not yet come. Computers have only been widely available for about half as long as cars have. Perhaps in another 30 years or so computers will be enough like cars are now that such a show would be possible.