Nice. But why so slow? I'm talking about the animation and the delay for the description, close button etc. to appear (and when they do they move the image so it's kind of annoying (not mentioning that you have to wait to see if there's a next-button or something)). It took about 3 seconds from click to being completely done (for a cached image).
Anything but at fraction of a second for a animation can destroy an entire site, in my opinion.
Also, when the browser loses focus the image disappear (chrome 12) :( Just to reanimate when focus returns.
/rant
Sorry, a demo doesn't deserve the rant above, but it really bugs me that this is so popular and I guess the only reason for why it's popular is because the default values for lightboxes are slow just to show the effect.