What is the best way to determine the current best selling/most popular general consumer goods at the present time (i.e. based on the last 6-12 months)? For example, if you went to a site like www.shopping.com - you can see all the mainstream product categories ranging from TVs, DVD Players, Digital Cameras and so on. I need to compile a list of say the first 10,000 most popular products right now, whether people are searching it in retailer sites, comparison services or even plain search engines like Google. How should one go about this task? Is there a keyword tool available that allows the user to filter based on shopping trends?