I used a Cannon-C3000 (3.3 Mpixels). Bought the camera for a trip to alaska a few months ago, it works great and is a fantastic complement to a 35 mm.
the thermistor is very low, so a flat 10K thermistor taped to the topside of the CPU and hooked into a DigitalDoc will give me more accurate readings of core temps. Resoldering the thermistor is an option but my soldering gun has the wrong tip, besides, the leads on the thermistor look too small to reach to the bottom of the CPU..