> I know about the subscriber link, but is it OK to include it in a blog, for example?
Yes indeed. The idea is that subscribers have an opportunity to point out good (or even bad, I suppose -- hopefully not too many of those :) articles to their friends, colleagues, blog readers, and so on. Some of those folks may become LWN readers, and some of those may become subscribers.
Beyond that, it is one of the privileges of being an LWN subscriber.
So far, we have seen relatively little (or no) abuse of subscriber links, which is not really all that surprising, given the kinds of readers we tend to attract.