I think this site
http://permaculturenews.org/ often has interesting information on a wide variety of topics. Many of the forum members here have relevant blogs (I really like the Post-apocalyptic pig for instance). There are a lot of sites that are good if you're looking for a specific thing, though not covering a wide variety of subjects.
I ended up joining these forums after years of ending up here when I needed good information on a wide variety of topics. Even when this site hasn't already addressed an issue, forum members are good about helping to connect people to relevant resources.