To learn how to "read math" with your kids:
Read Any Good Math Lately & It's The Story That Counts by Whitin & Wilde, - how to "read" math (K-6)
Articles "THIS is A Math Book?" and other resources on the Just Read It! pages will help you see how picture books teach math to younger children
High School and Adult level, for self ed / increasing YOUR enthusiasm:
Denis Guedj, Numbers: The Universal Language (art and math)
Clifton Fadiman, Fantasia Mathematica Anthology of logical/mathematical short stories
Isaac Asimov, On Numbers, The Realm of Number, The Realm of Measure, and The Realm of Algebra
Michael Guillen, Bridges to Infinity: The Human Side to Mathematics (not a formula to be found :o)
David Wells, The Penguin Book of Curious and Interesting Mathematics
A bit more advanced, but accessible and "human" math: Philip J. Davis, Reuben Hersh, The Mathematical Experience Adult level, understanding what mathematics is, humanizes math.