Logitech's drivers have been implicated in failures to install Leopard, and certainly as a result of reading about those issues, I have no intention of installing them again on my Leopard systems. (I did a clean install, so the blue screen problem didn't actually hit me.)
However, I can't type on the standard (latest) Apple desktop keyboards, and much prefer my Unicomp buckling-springs one. But Apple's keyboard layouts don't actually match PC keyboards very well. So although I do *have* a Logitech mouse, I was only installing the drivers in order to get at the Logitech keyboard layouts.
You see, the Logitech keyboard and mouse drivers are only necessary to drive the special function keys that festoon Logitech equipment; but just to get the normal typing keys mapped correctly, you only need the basic layouts. It turns out you can just install those keyboard layouts, and quite easily.
If you're comfortable in Terminal, this single command will do everything ...