David Cox's Problem Solving Rubric:
Giving them the rubric was huge. From that day on, student's showing work ceased being a problem. They all realized that everything in class became an opportunity for assessment, I was clear about my expectations and they rose to meet them.

[I liked this, and thought others would, too. -SueV]

Marzano checklists here and here for standards-based grading [Via AtlTeacher]

Standards Based Grading Gala #1 (McTownsley)

SBG Blogs