A nice article at DMNews (Direct marketer news) on how blogs can help ecommerce stores draw more traffic, and make more conversions:
Blogs and Bling Bling: Companies See More Sales, Improve Search Position
I am tempted to suggest that it isn't the blog format as much as it is the communication that blogs offer that make a difference to sites. But, a blog can make it easier to have that conversation with shoppers.
