This is a slightly geeky post, but Google has published a method for telling them about your logo.
The benefit is that it will enable Google to display your branding along with search results from your site. This is actually a fairly big deal, and a way to stand out from the crowd -- at least until every other winery is doing it, which (given the glacial pace of technological innovation in the wine biz) will be a while.
Pass this along to your webmaster. They'll know what to do with it. I expect the nice folks at Vin | 65 and eWinerySolutions are already on it.