Calculate prime gaps
Python, 121 110 109 108 104 103 characters
p,n,m=[2],3,0
while 1:
 if all(n%x for x in p):
  c=n-p[0]
  if m&lt;c:m=c;print(p[0],n,c)
  p=[n]+p
 n+=1

First time I tried to answer here, I hope I did it right... not sure I even counted the characters right.
Hmmm, I could save another character on the print by downgrading to Python 2.x...