Definitely I'm using the latest-latest Shareport for Mac--for now. It does work on the PowerPC/G5 desktop, with only the strange files/folders in the root directory syndrome.
However, I'm pretty much going to move on at this point.
I also may just mothball Shareport entirely since it is probably going to dead-end with the onset of Lion and the death of PowerPC. For D-Link to even develop a Snow Leopard version at this juncture would be a wasted effort--not to mention that the DIR-655, at least the one I have, is now a three-plus-year-old router.
So, thanks for the input and suggestions everyone.