To all three or four people who care about the quest to measure CPU power usage, I finished building the new and improved ammeter.
It features 0.02% precision resistors, a gigantic improvement over the old 1% tolerance. It has on board a capacitive charge-pump, to eliminate the necessity of tapping into the -12 V line. Analog isolation has been replaced with superior digital isolation. Op-amp input offset voltage has been reduce 40 fold. Yeeha!
Sadly, I messed up a bit on the assembly, and killed my ADC by feeding -9.2 volts into a pin rated for -0.3 to 6.0 volts. It really sucks to leave off one resistor.
Soooo, no exiting results or pretty graphs until I get a new one.
In mean time... Damn I make a nice circuit board!