In reply to your 3/20 post at http://www.fivedoves.com/letters/march2012/pattic320-1.htm I have never heard the story about Ham have an incestous relationship with his mother.  The Bible doesn't say anything about such a sinful relationship.  It just tells us the following:

 

Genesis 9:18-27,  "And the sons of Noah, that went forth of the ark, were Shem, and Ham, and Japheth: and Ham [is] the father of Canaan. These [are] the three sons of Noah: and of them was the whole earth overspread. And Noah began [to be] an husbandman, and he planted a vineyard: And he drank of the wine, and was drunken; and he was uncovered within his tent. And Ham, the father of Canaan, saw the nakedness of his father, and told his two brethren without. And Shem and Japheth took a garment, and laid [it] upon both their shoulders, and went backward, and covered the nakedness of their father; and their faces [were] backward, and they saw not their father's nakedness. And Noah awoke from his wine, and knew what his younger son had done unto him. And he said, Cursed [be] Canaan; a servant of servants shall he be unto his brethren. And he said, Blessed [be] the LORD God of Shem; and Canaan shall be his servant. God shall enlarge Japheth, and he shall dwell in the tents of Shem; and Canaan shall be his servant."

 

Below are the first two paragraphs in your post that you stated about Noah's youngest son Ham and about Ham's youngest son Canaan:

 

"Ham was the youngest son of Noah. Ham is the most notorious of the sons because of his act of incest with his mother. Because the Lord has already blessed Ham, as one of Noah’s sons, Noah could not curse Ham directly. Instead he curses Canaan, Ham youngest son, the product of that sinful union."

"Why would Noah curse Canaan, and not Ham’s other sons? Can Noah justify cursing Canaan if Canaan was the offspring of the union between Ham and his Sethic wife? No, he could not unless Canaan was somehow connected to Ham’s sin. As we have discussed before, God points out Canaan as Ham’s youngest son at the time that they leave the Ark. Long before Ham commits the act; long before he has 3 others sons; and long before Noah tilled the earth and produced the vineyard, which produced the wine that made him drunk."

 

Ham greatly dishonored his father Noah by telling his other two brothers about their father's naked and drunken state.  So since Ham is the youngest son of Noah, Noah decided to place a curse on just Ham's youngest son Canaan and not on all 4 of Ham's sons.  Also God didn't prophetically point out Canaan as Ham's youngest son at the time that Noah and his 3 sons, and their wives left the ark. Moses wrote the book of Genesis many, many years after these events took place and not as these events were taking place because Moses hadn't been born yet just like Canaan hadn't yet been born when his father Ham left the ark.  Ham's 3 other sons also had to be born first, and Noah's vineyard had to be planted where the wine came from that he got drunk on.  Moses wrote down these facts a long time after they happened.