A day after the verdict, the consensus is that Clemens' acquittal doesn't mean he's innocent, but rather that the jury was unconvinced of his guilt beyond a reasonable doubt.
That is certainly one possibility.
The other is that the jury went O.J. on prosecutors and ignored the evidence at hand.
This is a case, if not an air-tight case, where jury nullification may have played a role for some jurors.
When Clemens walked out of a a federal courthouse acquitted on all six charges that he lied to Congress about his alleged use of performance enhancing drugs, I can't help but feel that yet another jury told the federal government that it's time to stop wasting time and taxpayer money policing a child's sport played by man-children.