If you try to prove something with a lie then you look like a fool. I've followed this story very closely and after looking at all the evidence cannot help concluding that the documents are forged. I think DUer's should really consider the evidence so they don't get caught.
Although all the features such as superscript and proportional fonts existed on typerwritters during the time, *all these features did not exist on one typewritter.* This is why the freepers are offering something like 10,000 bucks for anyone who can reproduce the documents on a typewritter. On the other hand, one can type the documents in MS Word and get essentially a perfect copy. What are the odds that a machine over 30 years ago would have the exact same leading (space between lines) and kearning (space between letters) as Word uses? Moreover, the heading for the docs is perfectly centered, not even 1 mm off. You cannot get such perfect centering with a typewritter.
Defenders of the documents point out that the the MS Word reproductions don't match up exactly. But keep in mind that MS Word does not print documents; a printer does, which can account for the slight alterations of the baseline. In addition, copying and faxing documents might also allow for the discrepencies.
Here's my guess as to what happened: someone knows exactly how Bush avoided Vietnam and how he didn't fullfill his guard service. This person knew all the details, but didn't have any smoking guns, so forged some documents. CBS got ahold of these documents and it asked other people if their contents were believable, and of course people in the know, such as the secretary, said yes. CBS passed the documents to the White House, who looked at them and said holy shit! This is exactly what happened. So the White House didn't denounce them. At the same time, CBS ignored some critics who stated that the documents were foged:
http://www.washingtonpost.com/ac2/wp-dyn/A21675-2004Sep14?language=printerThey went ahead with the story, and now we have forged documents that state the truth.