When it comes to keeping readers coming back for more, keep your blog entries concise and to the point. When information is easy to take in people are more likely to read other entries and subscribe to your blog. In contrast when a story or article is long and uneventful your likely to lose many people as they head to find other information.
This is not to say an entry has to be short it just means you should work to break the article up and give it sub titles. This breaks it up and also gives readers a quick idea of what each section is about. Try this on your next article and you will notice a more user friendly format that keeps your readers longer and keeps them coming back for more.