Allow students to submit anonymous responses to questions.
I wish to poll my class, but they should be able to answer anonymously. Otherwise, I can't ask questions that might be considered personal.
Jung Choi commented
Yes, for honest feedback or for sensitive questions, the "anonymous" option should note only that the student has submitted an answer, without showing how a particular student responded.
This would also be a good way to get honest feedback part-way through the semester, with the incentive of it being anonymous. Let them vent in a more constructive way than the end-of-semester reviews.
I also think this is extremely important.