This page contains a list of free tools and resources for online teaching. It's geared toward language-learning, but has a wide variety of different things.

Whoops, I seem to keep finding things that have already been posted!

There are some great suggestions and examples of how to use social media to increase the "social presence" element of the online classroom.

Here are some more Classroom Assessment Technique resources!

This article applies Bloom's Learning Taxonomy to online teaching, suggesting concrete activities to promote each phase of student learning.

Here are some tips and tools for implementing universal design into online and blended courses.