Not only does she do all this exhaustive testing and research to write books about all the makeup and beauty products available, she also created a website about them. What a wonderful woman!
Here's the home page: http://www.beautypedia.com/default.aspx
Here's the Master List of all the different brands with reviews of some of their products: http://www.beautypedia.com/brandlist.aspx
If you pay a membership fee of $24.95 US per year you have access to all the individual product reviews and her list of "Best Products" as well as the latest reviews as they arrive. Or you could buy one of her books which covers the same ground but obviously goes out of date very quickly...
Great way NOT to waste money on useless beauty products as she does all the work to find out what's best for you to use- fabulous!