The base-est Yes. It is a database. It contains phone numbers and addresses of wineries. You can sort by name and location, you can not search by location or proximity. There is a database field for winery website but it is blank even in cases where I could find a winery website. The database is not editable so I could not add websites I found. There is also a map that has no 'key' describing the color regions in the map, is not scalable, and does not show wineries on it. Google is free and better.
Added new region data and included search by region option.