Here is an interesting case study article about how Stamps.com changed some things around on their home page design and it helped their conversions.
Turning Browsers Into Buyershttp://www.inc.com/magazine/20070901/turni...nto-buyers.htmlQUOTE
Anyone who does business online worries about how to boost Web traffic. But traffic is only part of the story. Equally important is the conversion rate--the percentage of customers who actually buy something. On average, companies report that only 3 percent of Web surfers actually buy, according to a survey by Shop.org, a division of the National Retail Federation.