This report on DI and UDL (updated 2014) has an introduction to differentiated instruction with a definition, sampling of considerations and curriculum applications, and research evidence for effectiveness. The second part of the paper addresses UDL applications of DI.
Created in Alberta, "this collection of professional learning resources can be used to build educator capacity through self-study, in-school professional learning communities, and district-wide learning opportunities." (site)
This resource provides teachers with an Alberta context for differentiated instruction, and information and strategies for implementing differentiated instructional practices to better meet the diverse learning needs of all students.
This site has resources and videos drawn from neuroscience, which can provide educators with a scientific basis for understanding best practices in teaching and offer a new lens through which to look at challenges. (site description)