Hey, I've created a site for making/tracking predictions called The Red Book (http://rdbk.net/). It's simple, just Will/Won't votes on predictions with a little gamification added to encourage community involvement. Just thought I'd plug it here if anyone is interested.
I'm using Yeoman to develop one of my web applications, which is a Single Page Application on a MEAN stack. My client side application is just HTML5 & AngularJS which uses a node.js/express powered REST API. The Yeoman workflow, along with the Angular Generator, is a great fit for this type of development.