Question: Why don’t you check your Technorati ranking?
Answer: Because the data won't change my actions. Getting data for no good reason just drives you crazy. The secret is to get very flexible in the face of data you care about - changing your x every time you see y changes - and incredibly inflexible in the face of data you don't care about.
This is the heart of why a lot of people have problems with BI. It's from