One-stop shopping for rubrics. This site contains a great rationale for using rubrics, advice on how to write good rubrics, and links to sample rubrics, rubric collections, and rubric generators (Try the Rubistar generator and storage link).
Instead of listing all the different ways a task deviates from the target, the single-point rubric simply describes the target in a single column of traits.
This is a great summary of UDL and a rubric-type chart of practical ideas for getting started in implementing UDL. Thanks to Maureen LaFleche for pointing me to this site!