Scaling analog signal before ADC: A low cost, low pin and component count solution
You can make a non-inverting amplifier with for instance a Linear LT1677, which is a single supply rail-to-rail opamp, operating from 3V.  

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National's LPV511 is also low voltage (starts from 2.7V) and rail-to-rail in. Output goes to 100mV from the rails. Also much cheaper than the LT1677.