An unscientific survey, but interesting nonetheless.
One of the sellers that was willing to give me more detailed information was Benjamin Clark from The Decal Guru. They saw a quadrupling of orders for MacBook decals since the airing of Apple’s ad. In terms of unique visitors they saw an increase from a steady 500 per day (prior to the ad) to 4,500 at its highest last week.
If you haven’t seen the ad, here ya go.