I use the Logitech Trackman Marble Trackball mouse and I've used it for about 15 years now. Or to be more accurate, I've used about 6 of them in that time and just ordered another. It's the buttons that eventually fail rather than the trackball. The trackball can be easily popped out, without tools, to clean the ball, the contacts and the optical window.
What I like best is that the mouse is stationary. I like to clutter my desk and really appreciate not having to move a mouse around on it. What I like second best is the quick and easy cleaning.
Rain most of the time since early Monday morning and there's no end in sight. Very hard rain at times. In weather like this I think of the letter carriers who are on foot, since I had a walking route for many years before I retired. Hardest delivery day ever was the day that Hurricane Floyd hit in 1999... it was completely impossible to keep everything from getting soaked that day, with about 15 inches of rain falling in one day. Things only got worse after that first day... long story... not a whole lot of fun in this part of NC. These are photos taken (by the city of Rocky Mount, where I carried mail) in the days after the flood.
http://www.rockymountnc.gov/floydphotoalbum.html
Well, took this song seriously I guess: