We've examined data for the past 3 months, and found the following trends:

Affiliate / Referral Schemes 

There are schemes whereby you become a partner, and the more sites you visit the more visits you receive, through having a higher listing in their search / categories.

Typically, it appears these visitors are low quality as they total average from most referral schemes view 1.03 pages per visit. This suggests that these are not bona fide visitors these are people who intend to buy. They are visitors who are clicking through pages to get their own site higher. Which means more visitors clicking with no itnention of buying. Perhaps I'm being harsh, but typically we expect about 5 page views per visitor. 1.03 is falling well below this mark.

Ask yourself this: if you were clicking through sites to get your own site listed higher, would you pay attention to the contents of these sites?

Product Description Quality

No doubt about it; products with long descriptions sell way better than products with short desriptions. Lots of the comments on the Google Product Search Article are generally relevant, and you should read through that. Long descriptions, light on the hard-sell, properly formatted text, caps used where approPriate, etc. These are all the things you need to have in the back of your mind, all the time.

Extra Images 

Extra images have a small influence too - online selling isn't the same as retail selling where people can pick an object up. You have to make them really, really want the product. Extra images are a great way to push this.

Large, clear images

Images should be, at a minumum, 400 x 300 pixels wide. Nobody wants to buy something they cannot see.

I will have a dig aroud for articles relating to this kind of information, and if I find anything very very useful you would benefit from, I will let you know.