Karmurl is a free and simple way of getting instant feedback for your work. You give feedback to receive feedback.

The idea was inspired by a comment made by photon_off (http://news.ycombinator.com/item?id=1683309).

I should mention that I have already submitted this once previously (http://news.ycombinator.com/item?id=2999852), but at the time it had very few users and therefore offered less value than it does now.