Code Golf: Conway's Game of Life

Answer 1

Ruby 1.9 - 189 178 159 155 153 chars

f,n=$*
c=IO.read f
n.to_i.times{i=0;c=c.chars.map{|v|i+=1
v

Edit: Handles newlines with 4 chars less.
Can remove 7 more (v) if you allow it to clobber newlines when the live cells reach the edges.