Since most shows on television started wondering towards reality tv / topgear style content, i've started turning to the internet for "normal" car show entertainment. While not on television, a couple of internet shows have good content, with the right setup you can watch these shows on your televisions in HD...
MotorTrend channel on YouTube - content that spans their sister publications like HotRod Magazine (show is called Roadkill), 4Wheel & Offroad (show is called Dirt Everyday), and some motorcycle publication that I can't recall. The MotorTrend shows are more informative and comparative of new cars on the market while more serious than something like "TopGear" it's definitely still entertaining. Their HotRod Magazine show "Roadkill" seems to be a sort of 'how to'/'TopGear' goofing around show, and the 4Wheel & Offroad show "Dirt Everyday" seems to be geared more towards how to (e.g. how to turn that old Chevy military truck into a rock crawler, etc.). They also have a motorcycle show, and a weekly talk show (Wide Open Throttle).
The "/Drive Network" - publishes on YouTube. It has one of my favorite shows, "/Chris Harris on Cars". This channel/network has a variety of shows that spans muscle cars, hot rods, tuner cars, motor sports, car care, and new car tests (in addition to the obligatory weekly talk show).
FastLaneDaily: Car news show that publishes Monday - Friday. Typical show is under 15 minutes.
Of course, there's also Jay Leno's Garage, and Adam Carolla has a show too (CarCast With Adam Carolla). I only watch select content from these channels as i don't find most of it interesting/entertaining.