Originally Posted by: DeadInMagazinesCorrect me if I'm wrong...but isn't a blue note a flatted third? I think that helps answer the question.

The Blues Scale is a variation of the Minor Pentatonic.
It contains all the notes of the Minor Pentatonic, plus the diminished 5th.
So, the generic formula for the blues scale is:
[1-b3-4-b5-5-b7]
[E-G-A-Bb-B-D]
As you can see, the blue note is not the flatted third, but the diminished 5th.