My buddy Rob Snell of Snell Brothers who blogs about Yahoo! store among other things has a guest post on the official Yahoo! store blog.
Rob is an amazing wealth of ideas and energy. In fact if it wasn't for his early support Top Right wouldn't be here. That said, he is busy so he only shares when it really makes sense (or dollars, that is). So, I am pretty happy to see him on the email thing. Sometimes email just gets lost in the mix.
So, over at the official Yahoo! store blog, he opens the books and shares real numbers on his email marketing campaigns. Go check it out - http://ystoreblog.com/blog/2009/02/email-works/