Don't have one? Neglecting the one you already have?
This post points out why you might want to reconsider the value of a winery blog. With a new emphasis on fresh content, Google's latest search engine update (called Caffeine) makes regular posts to your winery blog even more valuable.
Of course, you should already know (using a tool like Google Analytics) what percentage of your traffic comes from search engines, and that will help you make an informed decision about the value of search engine traffic. Here's a picture of the traffic sources for this blog over the past 30 days from Google Analytics: