However, for those who don't have the time to plow through all 375 pages of The Da Vinci Hoax, I heartily recommend Mrs. Welborn's De-Coding Da Vinci, which in itself is an excellent rebuttal. From what I've heard, the novel itself was rather bad and despite Dan Brown's claims to be factual, is anything but. Consequently, it doesn't take Ms. Welborn more than a hundred or so pages to engage in a sufficient point by point refutation of his chief allegations. A quick but very substantial read.
One more thing -- I particularly appreciated the study questions at the end of each chapter, and the recommendations for further reading, making this an ideal text for use by any youth minister or teacher wishing to discuss the claims of the novel with his class.