Some of my favorites are:
#3 - The 411 - Describe the author’s objective. Or better yet, the teacher's objective of the lesson.
#35. Tagxedo - What are key words that express the main ideas (or concepts)? Be ready to discuss and explain.
#53. Misconception Check - Given a common misconception about a topic, students explain why they agree or disagree with it.
53 Ways to Check for Understanding