Now, I'm sure that many of you old JavaScript hacks out there have known this sort of thing was possible for a long time, but it's very cool to see it (a) actually being used for something real, and (b) where normal users will see it.

Maybe Google is a big, sufficiently famous enough company to rescue DHTML and Javascript from being thought of as the tools of popup ads and get back some of the cred that has been lost to things like Flash over the years. Maybe.