Ask HN: Javascript tour for new users?

I am thinking about implementing a javascript "tour" for new users that join my app. When a user signs up, they would be redirected to the dashboard. On this page, nice looking Javascript flash divs would fade in, explain a certain aspect of the app with text (think speach bubbles), fade out, and repeat a few times to cover the main features (all on the same dashboard page). It wouldn't be difficult to implement, and I think it would be a great way to introduce the user to the app in under a minute. It's either that or a welcome message and a quick video (screen capture style).

Thoughts?