$/sale: How much you are likely to earn based on sales from the previous two weeks. Refunds have already been factored in too, so it's a great little metric. In fact, if you're good a math then you'll be able to do a little reverse engineering and figure out what the refund rate is of a product BEFORE you get involved.
%/sale: Simply the percentage commission you earn. Looking at $/sale is a better metric s you'll get to see almost exactly how much you'll earn per sale.
%refd: What percentage of sales were refereed by affiliates. The difference is direct sales — which I guess would be from the merchant (or ClickBank themselves when their tracking chooses not to work. Oops, did I say that out loud?)
grav: This is a kind of cryptic metric, but an important one never the less. The higher the number, the more affiliates are promoting it. It's a good gauge as to how popular a product is and whether its selling or not. Anything between 30 - 100 is pretty popular. Less then 30 and it's either new, or the market just isn't that big. Above 100 identifies a very popular product.
