If you want to find out the highest converting Clickbank products to promote as an affiliate then you may want to consider installing the Clickbank Product Evaluation Tool.
This piece of software analyzes Clickbanks sales data to determine which products have the highest refund rate, the most affiliates promoting and which ones are the top sellers.
For more information on how the Clickbank affiliate marketplace works check out the Clickbank website at
Digital Products Retailer: Affiliate Program & Sell Online - ClickBank
A very informative blog post about the different Clickbank sales stats is located at the link below. Here you'll find out the definition of, grav, %refd and %/sale actually mean. Check out the Clickbank definitions at:
* Selecting a Product to Sell From Clickbank*::*Marc Quarles
To download the Clickbank Product Evaluator Tool directly follow this link:
http://marcquarles.com/tools/product_evaluator.exe