The rubrics listed below can be used in a variety of online learning contexts. For example, there are rubrics to grade online discussions, participation and collaboration. There are also rubrics for grading reflective writing exercises (including reflective blog entries) and e-portfolios. I will add to this list on a regular basis. 

Rubrics for Assessing Online Discussions, Participation and Collaboration:

CU Online Handbook (2009): Grading criteria for reading response and facilitation of threaded discussion on p.42 and a rubric for assessing collaborative contribution on p.110

The University of Rhode Island: Various rubric resources for assessing different skills (e.g. critical thinking, teamwork, problem solving, civic engagement, global learning, information literacy, reflection, etc.) [or the full list is provided here]

Rubric-creation tool (might give you some ideas!)

University of Wisconsin-Stout: Rubric for assessing online discussions

Rubrics for Assessing Reflective Writing and Reflective Blogs:

DIT Worksop for Reflective Writing and Blog Assessment (some definitions of reflective writing and good/ bad examples of blog posts)

Colorado University CU Online Handbook (2011): Rubric for a script writing project on p.78 and a rubric for grading blogs on p. 117

Colorado University CU Online Handbook (2009): Rubric for blog reflection on p.38

University of Delaware: Rubric for asynchronous discussions/ reflections

Guidelines for assessing student blogs (including rubrics)

University of Wisconsin-Stout: Rubric for assessing blogs

Reflective Blog Post Scoring Guide (Gary Abud)

Rubrics for Assessing Student Media Projects

A Grid for Evaluating Student Media (Audio, Still Images, and Video Projects)

Rubrics for Assessing E-Portfolios:

University of Wisconsin-Stout: Rubric for assessing e-portfolios

Rubrics for Assessing Wikis:

University of Wisconsin-Stout: Rubric for assessing wikis

Rubrics for Assessing Podcasts:

University of Wisconsin-Stout: Rubric for assessing podcasts

Rubrics for Assessing Twitter:

University of Wisconsin-Stout: Rubric for assessing twitter

Other Rubrics (for assessing Writing, Maths, Science, Oral Presentations, Research Process, Web Sites, etc.):

University of Wisconsin-Stout: Rubrics for assessment (for both online and face-to-face activities)