Description: Enables intersection of categories: [your url]/?cat=1,2&and=1 will show posts only in both categories 1 and 2. [your url]/?cat=1,2&and=0 is the default functionality (shows posts from categories 1 or 2). Author: Kelly Dwan Version: 0.2 WordPress 2.6 – 2.8 My first foray into the world of wordpress plugins, born of need for exactly that functionality. […]