Magna Casta is mainly about the Portuguese wine world and if you’re interested in knowing more about Portuguese this is a great place to start looking. The site is in Portuguese but you can always navigate a translate version.
Magna Casta is very different from your usual wine blog in that it organizes information in an easy to find way. The site has 4 main sections: Wine where you can find wine reviews, Restaurants with reviews of restaurants in Portugal, Tourism with great descriptive articles of their winery visits and an Information section with such things as the Portuguese official wine regions.
You can follow them using the RSS feed but I would recommend dropping by the site once in a while and just loose yourself in the really good content.