>Anyone seen a microprocessor/microcontroller with integrated temp sensor?

The MSP430F1232 (and some others) have what you are asking.  I don't know
how accurate it is though.  Look at the below example from TI's site:

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = INCH_10+ADC10DIV_3;       // Temp Sensor ADC10CLK/4
  ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;

  while(1)
  {
    ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion start
    _BIS_SR(CPUOFF + GIE);              // LPM0 with interrupts enabled

//  oF = ((A10/1024)*1500mV)-923mV)*1/1.97mV = x*761/1024 - 468
    temp = ADC10MEM;
    IntDegF = ((temp - 630) * 761) / 1024;

//  oC = ((A10/1024)*1500mV)-986mV)*1/3.55mV = x*423/1024 - 278
    temp = ADC10MEM;
    IntDegC = ((temp - 673) * 423) / 1024;

    _NOP();                             // SET BREAKPOINT HERE
  }
}

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