Web of Trust is a traffic light symbol system that displays how safe a website is. The difference is this is not decided by an anti virus company, this is a crowd sourced system. You can see the icon next to your address bar in the browser.
Sites are rated by a global community of users, who rate the website based on their experience of using them. It also will display a rating next to the search results. Links in applications such as Twitter etc and also covered as well.
You can click on the icon to display more details about the site you are concerned with, it looks like
You can also download the plugin from this link. So what extensions do you use with Chrome, please feel free to pass them on.
I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me here.