The top side of the logic board houses all of the ICs:

Hynix H2JTDG8UD2MBR 16 GB NAND Flash

Apple 343S0593-A5

Apple 338S1116 Cirrus Logic Audio Codec

Fairchild PCHPS FDMC 6676BZ

Fairchild BC7BE F0MC 6683

Apple 338S1077, aka Cirrus Logic Class D Amplifier (thanks Chipworks!)

STMicroelectronics L3G4200D Three-Axis Gyroscope and LIS331DLH Three-Axis Accelerometer