A well used feature on HCN is polls, but they've been serving a double purpose, rather poorly. In many cases what it appears people are really wanting to do is make predictions, allow people to bet on them, and keep a running tally of people's acumen as soothsayers.
To better serve this purpose, I've created a new content type called a Prediction. As with a poll, you give a prediction a title, description, and two or more options for members to choose from. In addition, you specify a reckoning date, and closing date.