Over the last few months, some of the contributors to the History Commons have been scanning 9/11 Commission documents recently made available at the National Archives (masterlist here). The vast majority of the work has been done by Erik Larson (a.k.a. paxvector), although Matt and I have helped with the analysis.
After scanning, the documents were uploaded to a dedicated site at Scribd. The name of this site was related to History Commons, but has now been changed to http://www.scribd.com/911DocumentArchive to reflect the fact that it only has documents related to the 9/11 part of what the History Commons does and that it is a semi-independent activity that just happens to be done by some of the contributors.
The URLs for files that have already been uploaded should stay the same, but if you’ve bookmarked the homepage, then you need to update your bookmark.