Negative Margin

I think you could create the animations in CSS3, though it would take more time for this example.  Still interesting.

Seems like the text is rendered better which you would think wouldnt be the case coming from an image.

webkitbits:

My workmates at Sencha have created some excellent examples of CSS3 ads, based directly on current Flash ads. While they will only render in WebKit-based browsers, you can see they are actually more performant and smoother than their Flash counterparts.