Systems and methods for facilitating online comparison shopping, including a similarity engine, a navigational system, and a step skipping system. The systems and methods according to the invention include a method for determining similarity between two preferably disparate products. The systems and methods also preferably include a method of increasing efficiency of navigation in a comparison shopping site based on product coverage and product entropy. The systems and methods further include a method of step-skipping to quicken user navigation through a comparison shopping site.