Is Curiosity Valued in Your Classroom?

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I was just reading and viewing a video on Angela Maier's blog about curiosity. I've been thinking alot lately about the qualities that need to be fostered to nurture curiosity in our schools. The toddler who incessantly asks his parents questions. The small child who asks why. Where have these voices gone in our classrooms? There are days when I think we are so focused on programs, structures, and schedules that we have stamped out all opportunities for creativity to blossom.
Yet, we are challenged to help our students be 21st century learners who can think critically, think creatively, solve problems and collaborate. If we are do this, we must rethink the culture of our classrooms. How do you nurture curiosity in your classroom? What do you think needs to change?