Have to agree with millighost about your render, joepublic... although it's strange that the artifacts are showing in the cast shadows rather than occluded corners as you typically see with IDL artifacts? Possibly something else going on?

How much does min bias play into IDL occlusion? I mean, I've seen min bias artifacts as in mesh visibility or x-ray type artifacts (polygonal shadowing) that can be remedied by raising the min bias but...