Finding the right blog plugins can be tedious. These top 10 best WordPress plugins will all help your blog perform better. The must have plugins are. May 01, 2010  · Just two simple questions: What are must-use (mu) plugins and what are drop-ins? I’ll answer both right away: Must Use Plugins The MU or Must-Use Plugins. From pre-built themes and plugins to writing your own. Unfortunately, that’s not the case so…