We all do it.

We all go searching on Google for mentions of our games on fora and so forth. Not only does it allow us to see what people are saying about our games, it also allows us to contact those people, give them help, feedback or simply offer thanks for purchasing and playing the game.

This is where Google Blog Alerts come in. You may already be familiar with them. You may already be using them. If not, you should be. It's an immensely useful tool for talking directly to people who are playing and purchasing you game.