The User's Manual contains a description of the entire UI as well as the API documentation.
A series of illustrated and video tutorials (along with Maya scenes), as well as tips and how-to articles, teach various techniques and give an overview of some of the features found in 3Delight for Maya.
All release notes since the release of version 2.0 in May 2006. An ongoing Changelog, update almost on a daily basis, is also available.
This guide explains how to obtain and install the license key and start the license server. Note that this is not necessary for the free version.