Teaching children philosophy?

I am a big fan of Abe Maslow and his work in developing the hierarchy of needs. Over the years, I've come to appreciate it as an essential bit of knowledge for every person. It always pissed me off that it was only given a paragraph in the high school texts and a single class period in Psych 101. I made it a mission to toss that at my kids whenever we were giving any analysis to how they were feeling or were trying to figure out why someone else was acting the way they did. Making them cognizant of the need process has helped to develop some pretty cool, introspective and empathetic kids.

Lately I have been thinking the same about logic and philosophy. I have been thinking that perhaps one of the causes of our apparently moronic culture and the rampantly retarded lines of thought and logic is because we stopped teaching philosophy to kids. I did a bunch of reading on the subject to find that the excuses range from "not enough time" to "teachers don't know the subject" my favorite though was "it causes children to challenge authority". This kicked me into some exercises with my own kids (8, 11, 16). What a blast! I have never seen my kids have so much fun engaging in thought. Do any of you have any experiences with kid philosophy or any caveats?