Simple usb port current/voltage measurement with display.
http://www.aliexpress.com/snapshot/276751791.html http://rusticengineering.com/2010/05/10/oled-0-96-breakout-board-sh1101a-driver/
freescale ksz24/25/26
current sense, fixed at 80 gain: http://www.mouser.com/ProductDetail/Analog-Devices/AD8293G80ARJZ-R7/?qs=sGAEpiMZZMvEn2pkGav3bNYdL9E%2foSzJYdqf7Uk6kdc%3d that's a range of 0-4.125A with a shunt resistor of 0.010 Ohms. assuming 16-bit adc (on freescale kl25), ~15 bits per mA.
http://www.mouser.com/Search/ProductDetail.aspx?R=1571621-1virtualkey50660000virtualkey506-1571621-1