> I try to arrange desktop icons in a way I prefer. It seems that my choice is
Do you mean system icons like the hard drive and CD drives? They are
"placed" in a certain order on boot-up, and if you move them, on next
boot-up they are re-placed.
I once wrote an Applescript to put them were I want after boot, but it
ended up being a hassle. Not much you can do.