National Center on Secondary  Education and Transition
(Link)

The Following Publications can be downloaded from this site:

 Interagency Transition Team Development and Facilitation

Community Resource Mapping:  A Strategy for Promotion Transition for Youth with Disabilities.

Putting Interagency Agreements into Action

Transition Planning:  Community Mapping as a Tool for Teachers and Students

The Transition Planning Process

There are several other publications more specific to the Secondary Education Transition