Gonna learn me some Bayesian inference. Maybe.
Naïve Bayesian Classification Using C# and ASP.NET: "THE BAYES RULE
To understand and code for the na ve Bayesian algorithm, we will do some math to understand the procedure. The primary equation for the Bayes rule is:
P(A|B) = (P(B|A) * P(A)) / P(B)"
There's also this: http://nbayes.codeplex.com/
and this: Inference in Belief Networks - CodeProject