I've been touting the merits of the Gaming Index for a while now, but let me get on the pulpit again. The Gaming Index is one of the best tools out there for both publishers and consumers. It's integrated into the RPG.net reviews system and supports "mini reviews" and ratings of products. This means that by going to the page for a given product a consumer usually sees: The editions of that book, its publisher (with a link to all their products), the product line (with another link), all reviews, user comments, the current rating (and how it was determined), a picture of each edition, and even more information. That's crazy awesome. The Index is also the largest out there, even bigger than Pen and Paper.
As a publisher: You need to make use of this. Sig links to your games on the Index and encourage your fans to stop in, rate your game, and make a few comments. See how Spirit of the Century is the number one core game? That's, in part, because Fred bought into using the Index. Can the Index be manipulated, can a publisher skew results? Of course they can, but the more publishers embrace bringing people to the Index the more valuable the ratings overall become. To make this even better, RPG.net has a trust system built into ratings - the more ratings a user makes the more those ratings count - to keep a rush of fans making a single rating from being a problem. A pretty kick butt deal.
As a gamer: The Index may be the best first stop for any product now. It'll take you straight to reviews, show you comments and ratings, and generally make deciding on a product a lot quicker.Check it out!