I’ve recently rediscovered The University of Iowa’s online Child Language Research Center, which has some interesting material, much of it related to their work on Specific Language Impairment (SLI).  By clicking one of the following two links, you will be directed to the most informative areas of the site – 1) stats tutorials, published articles, and posters 2) newer posters and powerpoints, especially concerning their expansive longitudinal SLI study.  These guys have studied SLI and relationships among factors from reading, smoking, autism, comprehension, phonology and much more – some of which can be accessed at their site.  As a language diagnostician I especially enjoy the sliding scale exercise that challenges my assumptions regarding what should be considered a language impairment.

Snapshot of interactive sliding scale
Snapshot of interactive SLI tutorial