99% of the time when a user visits www.nopcommerce.com website their cursor is going to be up near the address bar of the browser they are in.
On the opening page a big magnifying glass with the words STORE DEMO is sitting there right in the middle of the page luring you to press it. As a new visitor, trying the store demo is probably one of the first things they'll want to do.
It's very annoying when you move your mouse down (again my pointer is up at the address bar), you inadvertently mouse over one of the other "tabs" on the image, and the thing scrolls on you.
It's very cool you can just mouse over the tabs to switch between them, but more often it's very annoying.
How about putting the tabs on the bottom OR make it so you have to click them to change.