The Facts:
1- Forged documents DID exist, but no-one knew about them until much later.
2- President Bush's decision was based on other factors, not the forged documents. (The facts affecting his decision included: The fact that Iraqi officials visited Niger--a country who's number 1 export is uranium--in 1999; Intelligence accumulated from several countries, including the UK; Saddam Hussein's unwillingness to cooperate; and a report by turncoat ex-CIA director Joe Wilson.)
3- President Bush never said there was evidence of a purchase, he only said Hussein "sought" uranium.
CBS is just trying to push the "Bush lied" agendum at any cost.
You forgot one other fact others here have mentioned: Rocco, the supposed source of the documents, claims the documents were part of his work for French intelligence.
Me thinks CBS pulled the story not because they needed to run the Rather piece but because this new development blew up the point of the story.
I.E. If the French forged the docs, well, the story may not follow on the heels of Rathergate so well. Given what we know here, I doubt Isikoff's, Matthews, and others failure to mention this seemingly essential element to the story is unintentional.
Randi Rhoades (yuck, how did we have good programming replaced by err america this week in Phoenix?), who is far more listenable than Franken, went on and on about this story yesterday. Of course, she doesn't appear informed enough to have realized that the French are apparently behind them. On a side note, I've tried listening to Air America to get a flavor for it over the last few days. My lord, they all appear to be of the "black helicopter" school of thought.