What can parents do to help children reach their potential in school?

We're all hearing a lot of talk lately about improving public schools and what communities can do to help their schools get better. What role can parents play? And how can parents help their children reach their full potential in school, whether it's public or not?
Update: Yahoo! Answers staff notice: This is really Marilyn vos Savant. Read this announcement for more detail: http://blog.360.yahoo.com/blog-d8pH0dcoRKeB12yOcnUQp.9VCFos?p=5759
Update 2: Marilyn vos Savant: Is this fabulous, or what?! We finally have a way to communicate with each other about the most important things in our lives--and maybe even the most important things in the world. What we need to do now is to keep it growing, and the good folks who are running this show will see that... show more Marilyn vos Savant:
Is this fabulous, or what?! We finally have a way to communicate with each other about the most important things in our lives--and maybe even the most important things in the world. What we need to do now is to keep it growing, and the good folks who are running this show will see that they've got a vehicle that can change the way the world works. What a ride this is going to be!
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