With Vitalik Buterin posting recently about Quadratic Voting I wanted to highlight this nice article about it that although not as technical, I feel is a good explanation. "Quadratic Voting is a method of collective decision-making in which a participant votes not just for or against an issue, but also expresses how strongly they feel about it. It can help protect the interests of small groups of voters that care deeply about particular issues. Quadratic Voting can be used in democratic institutions, in corporate governance, and blockchain-enabled collective decision-making."