I found this MO question while writing my own teaching statement. I'd like to point out that the Notices of the AMS published a survey which identified quite a few themes in successful teaching statements. I will paraphrase the list, beginning with the most-cited comments:

1. Specific examples linking philosophy to practice.
2. Dedication to teaching.
3. Good writing.
4. Thoughtful reflection on teaching.
5. Student-centered.
6. Match between individual and department.

Here's a handy rubric from the University of Michigan, also informed by a survey.

I found this MO question while writing my own teaching statement. I'd like to point out that the Notices of the AMS published results of a survey which identified quite a few themes in successful teaching statements. I will paraphrase the list, beginning with the most-cited comments:

1. Specific examples linking philosophy to practice.
2. Dedication to teaching.
3. Good writing.
4. Thoughtful reflection on teaching.
5. Student-centered.
6. Match between individual and department.

Here's a handy rubric from the University of Michigan.