Google Forms for More - a useful site explaining the basics of using forms as well as providing more advanced uses for Google Forms in the classroom.

Innovative Ideas for Using Google Forms - lists uses under the categories of: for students, with students, for administrators, for professional development, and for teachers.

79 Interesting ways to Use Google Forms in the Classroom - a slideshare of ideas.

20+ Google Forms Teachers Should Not Miss - pre-made editibale forms such as self grading quizes.