Google SideWiki Brings Comments to Everyone

Rophuine writes: "Google has launched a product called SideWiki. It takes the form of a plug-in to FireFox and Internet Explorer which allows users to "Mark Up" the web — add comments which can be seen by anyone else running SideWiki.

Is this a great new product which will bring new horizons to the internet? Or is this just another way for Google to know what sites we're visiting?"