As I outlined today in my column at SearchEngineLand, we're seeing Google Product Search send a lot of traffic and sales this year. I (dramatically) wrote that in some ways it represents the new battleground for competitive SEO... and I think it does. Google obviously wants to push Product Search and start cutting marketshare from the big CSE players.
The other tip in my article is to get Yahoo! paid inclusion while you still can, because it's going bye bye on January 1.