Perhaps some of you who work on e-commerce sites have some information regarding the effectiveness of quickbuy windows? I recently heard that quickbuy is actually not that effective for getting people to purchase, but is more useful for providing additional information about a product.
What I mean by quickbuy is the layover window that appears when you click or rollover a product thumbnail. It allows you to purchase from that window without having to click to the product detail page. An example can be seen on gap.com: