What change would like to see?

A shiftIn() function along the lines of the one in the sample code at http://www.arduino.cc/en/Tutorial/ShiftIn

We might also need/want a bit-order option to match shiftOut().

Wiring has recently added ShiftIn() and ShiftOut() with bit-order, and optional size and delay.

See here: http://wiring.uniandes.edu.co/source/trunk/wiring/core/WShift.cpp?revision=744&view=markup

And here (for prototypes): http://wiring.uniandes.edu.co/source/trunk/wiring/core/WProgram.h?revision=744&view=markup

r1058