I’ve got a lot to say about the Galactica mid-seson finale, but that requires time which a day prior to moving house) i don’t have at present. In teh absence of original content I will however point to some very good speculative (and highly spoilery) blogs that purport to analyze the Final Supper image and divine the identity of the Final Cylon:
Space Westerns applies a highly geometric analysis to the Last Supper photo.
BSG Last Supper is an entire blog devoted to analyzing the picture.
Cellounge is a blog ostensibly devoted to Japanese cars, however they have a lengthy analysis of the Last Supper using Leonardo Da Vinci’s original as a guide.
I’m pleased to see my earlier speculation is not invalidated by any of these analyses.