I didn't see anything about any finder improvements or any other real system improvements in the 10.2.3 read me, nor have I noticed any improvements in system speed or navigation. If someone knows that there actually was improvements to the finder, can you tell us, because the documentation and Apple say nothing about it.
This is all strange because the one thing I definately have noticed, besides the nice looking inset ichat buttons, is that my genie effect is much smoother now. It used to sputter about halfway through the transformation but now the whole process is smooth. Maybe I'm crazy.