Who cares if they are fake? There is nothing remotely controversial or interesting in the memos in the first place. Regardless of the feeble minded attempts of liberals screaming "DOWNING STREET MEMOS!" over and over at each other in internet chat rooms.
Dollars to donuts the vast majority of the Kool-Aid Set have no clue that Downing Street contains the official residence of the British Prime Minister.
As a caveat to my last post, I really wouldn't be surprised if this is a classic slip-and-slide operation by Rove/others to create a blood-in-the-water effect (calls for impeachment, speeches, Durbin, Rangel etc.) just before pulling the ultimate Lucy and all the Charlie Browns (and Brownettes) on the left let out a collective "Aaaaaaarrrrrrggggghhhhh!!!!!"