debouncing an interrupt trigger

BigMike's idea is a good one. Perhaps some variant like this would work?

void my_interrupt_handler()
{
  static unsigned long last_interrupt_time = 0;
  unsigned long interrupt_time = millis();
  // If interrupts come faster than 200ms, assume it's a bounce and ignore
  if (interrupt_time - last_interrupt_time > 200) 
  {
    ... do your thing
  }
  last_interrupt_time = interrupt_time;
}

Mikal