Writing an Artist's Statement

As I begin to apply to schools, I have found that many would like a personal statement, or, worse yet, an artist's statement, as the School of the Art Institute of Chicago requires. Unfortunately, I realized I have no idea what this means, less how to go about creating one. Here is how to write an artist's statement:

1. Keep it short, yet simple and engaging. About.com suggests about 100 words. 
2. Remember the W's: who, what, when, where, why, and how. Who you are, what you are doing, why you do it, and how you create, etc. "Don't bog readers down, but rather entice them to want to know more" 
3. Act like you know what you're doing: Avoid "I think" or "I feel" statements, and state it like facts.
4. Include: what inspires you, why you create art, what is your vision, who has influenced you, what are your goals, etc. You can find more ideas here.

What inspires you to create art? 
What are other aspect to include in a personal statement or artist's statement?