I consider my computer to be part of my photographic gear and Russ seems to agree.
After 20 years of using a Mac I have turned up to my new job yesterday to find that I was given a PC to use. I work as an illustrator/graphic designer and so I do a lot of drawing as well as photography at work. Being a Mac user I have used one click mouses for 20 years.
I previously posted the Arctic Butterfly as the most useless photographic object but if you include computers then the subject of the mouse comes up. I have used a mouse 7 hours a day to draw with for years.
So the most useless object that I have used is, to be heretical, the round Mac mouse. What a useless piece of $*%*^%$ &%$$%$ that was.
Not to be confused, coming a very close second is the standard PC mouse. Having 20 years experience using a Mac mouse with a straight finger click, moving my finger 15° to the left to click is unnatural and unacceptable. So on the first day of my new job, the first thing I did after work was to go to a computer shop and by a Logiteck PC mouse that ergonomically positions my finger for a straight click. Hopefully that will solve the problem or there will be a lot of mouses bouncing off walls.
As a result of thinking about this I had the insight to go to the system preference of my new Mac and to turn off the right click on my new mighty mouse. I now have a straight click and scroll wheel less scrolling. Having used Adobe products for years the left hand is used for keyboard shortcuts and in this case right clicks with the control key. All is good in the world, I'm happy!