Zero  
   A history of Zero that describes the introduction of zero and the main persons that brought advantages to it.
   http://www-groups.dcs.st-and.ac.uk/history/HistTopics/Zero.html

The Digit Zero  
   Some information about the number zero and links to other pages.
   http://www-personal.umich.edu/~danhorn/digits/zero.html

Zero in Four Dimensions  
   A paper discussing the historical, psychological, cultural, and logical perspectives of the number zero.
   http://www.pantaneto.co.uk/issue5/arsham.htm

A Rigorous Treatment of Division by Zero  
   By considering a new notion of division, one can allow division by zero, but the algebraic rules have to be modified.
   http://www.math.su.se/~jesper/research/wheels/