For out-of-the-box Sakai, the help files for most core tools are delivered from Indiana University's Knowledge Base repository. These documents also appear in the Sakai KB, which is updated dynamically; the help files within Sakai, by contrast, are cached, and so may not match the content of the most recent version of any given document.
The help files for most contrib tools are not pulled from IU's repository, but are written by the schools who develop the tools. Exact processes for revising them may vary.
As of June 2011, the following tools are pulling help files from IU's repository, and these documents are being reviewed regularly by IU support consultants. (We don't guarantee to get every tool reviewed for Sakai before the release of the next version, but we review documents for Sakai when we're checking the IU version for accuracy anyway.)
The following tools are pulling help files from IU's repository, but are not being reviewed regularly by IU support consultants:
The following tools have help files in IU's repository, but they have not been added to the Sakai help tool, as far as I know: