Make is going to have a live show twice a month (every second Wednesday). In episode 1 they are talking all about the Arduino microcontroller. In this episode they interview Steve Hoefer who made the Arduino gum ball machine that dispenses a gum ball when the secret knock is given.
In the second video which I am guessing was just the second part of the live show Collin Cunningham shows off his MidiVox Arduino shield.