SANS is a cooperative research and education organization for information security professionals. In addition to being a leading source for training and certification in the field, it has a website that is a veritable cornucopia of free information and resources.
We’d like to recommend in particular their free monthly newsletter, “OUCH!,” which they refer to as “the first consensus monthly security awareness report for end users.” This newsletter will keep you up to date on the latest threats and resources related to protecting your computer.
Security professionals may also be interested in “SANS Newsbites,” a semiweekly roundup of the most significant news items.
If you’ve got some time, you might want to spend it browsing the most popular White Papers on their extensive Reading Room. Though most are written for cyber security experts, many are relevant to the rest of us. Risk Assessment of Social Media, by Robert Shullich, is an example of a paper that should be read by everyone active on social media.