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This may sound rather simplistic, but a Wiki is a very unique way to collaborate on the Web. I, Steve Wainstead, set up a few while working at the New York Times on the Web, and the technical staff really took to them in a big way. They wrote 500 pages in just a few months (all to document the internal systems).

The addictive quality of a Wiki is that making pages is as simple as making a link to them. If they don't yet exist, the page link will be followed by a hyperlinked question mark; follow that link and you can define the new page.

With this setup, you can update and create pages from anywhere there is a web browser handy.