The American Association of Colleges and Universities' Assessment page, which includes their Valid Assessment of Learning in Undergraduate Assessment (VALUE) rubrics.
A master bibliography of web resources from Assessment Commons.
The ASSESS list-serv from the University of Kentucky.
IDEA, a non-profit in the area of higher education and assessment.
New England Association of Schools and Colleges' Assessment Resources.
Research and Practices in Assessment journal.
Program-based Review and Assessment, a very fine handbook from the Office of Academic Planning & Assessment at the University of Massachusetts Amherst.
And one of the best resources of all, Bloom's taxonomy, inverted with an emphasis on the higher-order skills: