This post on Flyertalk notes 3 quick Priority Club surveys which offer free points:
100 points: http://usa-survey.priorityclub.com/unfvmw
Answers are : C,D,B
100 points: http://usa-survey.priorityclub.com/fhaidt
Answers are: D,A,D
300 points: http://usa-survey.priorityclub.com/mwpvwj
Answers are: D, D, D, D, C
I had already taken the second and third surveys, it wouldn’t let me take them again. But it did let me take the first one.