If the primary focus of a site is to sell wine-related guidebooks, it should probably be listed in a subcategory of Shopping: Publications: Books. If the site is selling other wine educational materials or services (e.g. videos, classes) it is also inappropriate for this category.
Guides to wine regions are appropriate only if they have significant content about the grapes, wines or producers of that region. If they are primarily focused on general tourism of the region, they should be submitted to the appropriate Recreation: Travel sub-category, or to the appropriate subcategory of Regional.
This category lists guides and directories about Mexican wine, including lists, reviews, search engines and similar sites. Sites may cover wine websites, wineries, and wine in general, including specific types of wine and wine regions.