Greg Ellifritz's website, Active Response Training, is a very active site with at least 4-5 posts a week. Greg is also an instructor and teaches multiple courses ranging from "Tactical First Aid and “System Collapse” Medicine" to "Groundfighting" and much more.
Greg does a great job of coming up with different categories of posts. "Tactical Training Scenarios" based on a real "ripped from the headlines" event are thought provoking. They really make you think about how you would handle the particular situation being highlighted.
Other great posts focus on breaking down "mass casualty events" where perpetrators may have used multiple weapons, knives or bombs. Greg is considered a subject matter expert in this area and has been cited by others in this field regarding this topic. In particular, Greg rightly points out that the terror attacks that we see happening overseas will be headed our way at some point. It would behoove all of us to study these and make ready for what will end up happening here.
One of my favorites is the "Weekend Knowledge Dump". Greg is a voracious reader from what I can tell and he posts some of his favorite articles and blog posts that he has come across each weekend. Those links are usually right up my alley of interest.
Give Active Response Training a look. I think anyone who reads it will get some benefit from the many entries on the blog.