Natural Ergonomic Keyboard 4000 and
Logitech G5 mouse.
The keyboard is my 4th or 5th Natural series keyboard (I've worn out the previous ones). It is satisfactory. While it retains the Natural shape and looks better than the older beige models, some cutting of corners is obvious. It feels less solid than the previous MS keyboards I've had and has already been replaced under warranty once. However, that is what they sell at the moment and I am addicted to the Natural keyboard line, and don't want anything else.
In past, I have used various Microsoft mice. Last time around, Microsoft didn't have anything nice that wasn't wireless. I refuse to use a wireless mouse on a desktop computer, so I had to go with the G5 -- which I have been very happy with.