I'd never heard of the Vivísimo search tools till the Puppy Blender linked to their "clustered" hosting of the 9/11 Commission report. I'm sure they are getting a server spike right now, but the result will be exposure to a lot of people involved in corporate data management. We probably should have bought their stock today.
Another, more conventional aid to reading the report is also available here, the entire text is available for download (till Michele's bandwidth gets burned up) here, and carefully selected excerpts are available in the mainstream media.
Update:
II added Vivísimo to my Firefox search toolbar. It presents search results very differently from google; very interesting when is doing research rather than hunting a particular site.