Clifton Fadiman assembled a couple of anthologies of stories featuring mathematics and/or mathematicians as main characters.
Fantasia Mathematica
http://www.amazon.com/Fantasia-Mathematica-Clifton-Fadiman/dp/0387949313/
The Mathematical Magpie
http://www.amazon.com/Mathematical-Magpie-Clifton-Fadiman/dp/038794950X
Some are good, some are not so good.