Have I warped a rotor?

[shields@tembel.org (Michael Shields)]

What are the symptoms of a warped brake rotor?  Would they be pedal
pulsations under moderate pressure?

I am running OEM rotors with Metalmaster pads installed 1996-08-10 @
108542 (currently at 117k and change).  It seems to me that rotors should
last longer than 8500 miles.

What causes rotors to warp?  Did I do something wrong in the brake
job or am I just driving too hard?  If it's the latter, should I go to
cross-drilled rotors and if so from who?  (It seems a bit silly to have
drilled rotors in the front and drums in the back but if that's what
it takes...)
-- 
Shields.