In http://vimeo.com/3385181 Live Validations are demoed with what appears to be a standard scaffold-generated rails app. However, the styling is different (nicer) than that created by the standard rails scaffold generators.
What generator was used to make the video?
It is very likely (you don't actually see live scaffolding) that these forms have a CSS style-sheet other than the basic scaffold sheet attached and that some formatting has been done.
For example, there is a 'scaffolded' check box for the terms of service which, as far as I know, cannot be done with the RoR scaffolding tool.