What is the difference between nxtG and nxt 2.0? I'm familiar with NXT 1.0 and 2.0 but I've also seen reference (program samples, etc.) to NXT G. What's the difference?
NXT-G is the graphical programming software that comes with NXT 1.0 (8527) and 2.0 (8547). 



The NXT-G software has been improved for the second version of the set which also comes with a few different bricks (including different tyres) and a different box design.