Bill Kreuser's guide to soil test interpretation; read it! Here's how he describes it:

"While soil tests can be useful, their results are frequently overanalyzed and overinterpreted. Sometimes soil test results can be more confusing than helpful. It doesn't have to be so difficult. The goal of this publication is to explain which soil test values are important and which values can be ignored."

After reading the publication, I think it achieves that goal.