The first, which I just noticed today, by Pre Central user jhoff80 (thank you!) is a good walkthru:

The second, and by comparison, really lame vid I just posted on YouTube more as a test of the setup I plan to use to do a real demo:

Neither has music/sound effects. I'm going to see if I can't get pre101's tip for enabling audio will work in the 1.3.x emulator for the official demo video, hopefully coming this weekend.

Also, the website has been updated including a link to the app in the app catalog (if you're on a Pre or Pixi it should work).