Anyone interested in NdGT, check out the show he hosts: Nova Science Now http://www.pbs.org/wgbh/nova/sciencenow/ You can watch full episodes online, no commercial interruptions after they start. It does a good job at filling the popular science video niche, in addition to Through the Wormhole with Morgan Freeman.
Can someone explain how I have misunderstood and the show really is meant for kids? Because it's designed like a kid's show, complete with silly music, wacky editing, colourful demonstrations/analogies to illustrate scientific principles, and narration that sounds as if written for a toddler. In this respect it's almost as unwatchable as Michio Kaku's (who's ordinarily a bright guy) weirdly infantile Science of the Impossible series. (It's also an incredibly American show, formatwise, extremely brash and loud and fluffy.) I started watching the show as I'm a fan of Tyson, but I ended up disappointed.
For now, the only regular series (as opposed to one-offs like Jim Al-Khalili's excellent shows on atoms and chemistry, or Sagan's Cosmos) I consider worth watching is BBC's Bang Goes the Theory (http://www.bbc.co.uk/programmes/b00lwxj1), which is fairly obviously targeted at teens, but has some good content. Two of the hosts are fairly annoying generic twentysomethings who do the show as though it's some kind of music video programme, but the third guy is an adorable geek with an obvious passion for science and engineering, and they have some assisting hosts who are quite quirky.