Documentation
DIANETutorial gives a step-by-step explanation how to setup and run an application.
Frequently Asked Questions and Cookbook is a place to see if you have a problem.
Reference manual (version 2.4) is a complete reference of commands, environment variables and API. It also explains the computing model and implementation details (interesting for developers and advanced users).
Wiki pages contain more documentation on release process, plans, etc.
Note: the documentation is under reconstruction (access to old documentation page)