1. I unsubscribed to all the blogs that were constantly "plugging" something. It's nice that you have speaking engagements or that you'll be at this or that conference, but I don't care. I am interested in your family and your genealogy discoveries so if all you ever talk about is your next big gig, I'll have to delete you.
2. I unsubscribed to any blog that took forever to load or was slow to scroll. I'm not sure what design element is causing a "slow scroll" on your blog, but it drives me nuts. (Mental note, ensure my blog is not a slow roller.)
3. If I noticed that I deleted blog posts in my reader for months without actually reading one, I unsubscribed to that blog. I suppose our tastes are different from what they were when I first subscribed to you. We're different people now. Let's not make it any more difficult and just make a clean break.
I enjoy reading interestingly crafted posts written by people I don't know with relatives I have no connection to. I know this is because we share a common love of an uncommon hobby. They are not "my" people but I've learned researching tips and felt the joy of their successes and the frustration with their brick walls. This is my new high water mark for following blogs: talk about your people, give suggestions, share your stories and you'll have a pleasant place in my Reader.
So now my blog reading is lighter and I'm able to focus on the posts I enjoy, rather than all that annoying "mark all as read" work I was doing before.