Google Shopping is the #1 shopping aggregator according to this site: http://www.ebizmba.com/articles/shopping-websites
The #2 Coupons.com, is going downhill fast: http://www.alexa.com/siteinfo/coupons.com
The #3, Bizrate.com, is also going downhill fast: http://www.alexa.com/siteinfo/bizrate.com
So it does seem like Google Shopping is taking over traffic from other aggregators.
What the EU government does is toxic. It does what it get's told by smaller companies that aren't satisfied with their sales. Thats more than toxic since it changes the free market, however thats what the european government always did, they don't make goods for the people they make goods for the money.
At the bottom of the page is an About.. link, but they have infinite scrolling and I'm not fast enough to catch it. Quite an awful UI.
http://graphics.wsj.com/google-ftc-report/img/ftc-ocr-waterm...