The Velocity Docbook framework
If you came here, there is a chance that you stumbled over some docs on the web site or attended the "Apache Project Documentation" lightning talk at AC US 2006.
The Velocity Docbook Framework is intended to render all docs for Velocity 1.5 and beyond using the DocBook format. It has been released as DocBook Framework.
There is documentation on how to use this framework in the Documentation. Some Velocity specific information is in README.velocity.