Blogs.com has a lot of top 10 lists of blogs by topic. You can spend some time browsing for your favourite niche topics and will almost always find something. Some of the lists are getting link rot. I found a list: 10 Great Blogs About Grammar, Writing and Language the first blogs listed were all active and had relevant posts. Towards the end there was a moved blog and three were just gone. One was coming up with a Malware warning on Google Chrome but I had no trouble when I went through to read it.