New How To Calculate Track Current page under the PCB Design section of the website, with information, equations, and more info on how to calculate the maximum current a track (a.k.a. trace) on a PCB can take.
New NTC Thermistor Temperature Sensing page with information on PTC and NTC thermistors, including how to connect them up to a microcontroller for temperature measurements.
A screenshot of the NTC thermistor page.