Its a full length documentary on comparisons between the two.
Neil Godfrey wrote an extremely interesting post on the definite existence of celestial Christians in the Middle Ages. The alleged absence of Christians who believed in a celestial Christ has been used as an argument against the Christ Myth theory before.
Also, this blog was mentioned in a recent post on Mythodoxy.
I have received my copy of The Christ Conspiracy revised edition and plan to write a review soon.