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Earlier this year Protostack posted a turorial on Analog to Digital Conversion on an Atmega 168. This tutorial covers everyting from the low pass filter on the AVCC lines to the registers you will need to tweak on the AVR itself. We are sure that this will come in handy in our future projects as well as yours. Head over to the Protostack site and check out the full tutorial, and while you are there pick up one of the new Atmega 168 Development Kits or their Exprimenters Kit! Check out the schematic after the jump.
Click the image for a full sized version.