There are logos everywhere in the olympics and this site has put together a list - with images - of the adidas, hang ten feet, visa birds and whatnot that littered the opening ceremony. Even if you can't read chinese (but this might help) the pictures are still very interesting.
Hang ten feet? Were they really? It's those 29 feet that were helped with a little CGI (confirmed by officials) in the broadcast as a steady helicopter shot of live fireworks might not be able to run so smoothly. Here's what those footprints looked like from the ground (and without CGI-help) - they "walked" above the heads of cheering crowds. Pretty neat. I had no idea they were the Hang Ten logo-feet however, and all I can figure the poster on the Chinese site is saying is: "29 big foot bifurcations it may be said the impression is profound, but how did I look how looks like “jubilantly” (fireworks cost 3,000,000, advertisement value 3 hundred million)" - perhaps he knows more than I do on the topic.