[Semi Civil Servant]

How about the theory that a disgruntled and probably unstable individual with a vendetta against George W. Bush forged the memos to "get" the President?

Nah. Much to linear.

[Hank All-American]

Don't be ridiculous. Clearly, somebody took the original documents and ran them through an optical character reader, converting them to text. Once the text was revisable, he changed the terminology for clarification. Then, he scanned, cropped and added the signatures. Proof that these were actually based on authentic original documents couldn't be clearer.