My favourite so far has been the Happy Little Spaceships with CCP Jorg where he designs a spaceship on the fly and shows some concept art.
More surreal is the Does it FAT? #baking Starcakes with CCP Falcon and CCP Logibro #cake. What can I say. Watch it and learn about the pitfalls of making puff pastry.
For a full list of what has been aired so far, look here. I think CCP have been doing this as a trial to see whether there is sufficient interest. I hope it takes off and something more permanent happens in the future.