I went out and looked at this stuff.  The look is really nice.  The
only thing I don't like is the fact that you activate it by calling a
JavaScript function from window.onload -- which itself isnt exactly terrible,
but can be a nuisance because a) there's only one window.onload per
page and you often need to stack things up in there, and if you are
using prototype.js or other Ajax stuff it can get confusing, and b)
it's one more thing you have to remember to do on each page.  However,
in my mind those minuses are outweighed by the ease...