ipxodi writes "Logitech marks the milestone of 500 million shipped mice. Mice first widely appeared in consumer form on the original Macintosh, but have appeared in various forms back through time to 1964 when they were invented by Doug Englebart. My favorite mouse is also my current mouse, a Logitech Optical Wheel mouse. I also remember some oddities beyond the old bar-of-soap shaped mice of the mid 80's, like one with a crosshair attachment for clicking on specific points of a blueprintfor CAD input. What's your favorite current or past mouse?" My first mouse was back in 1987, for my Apple //c. It cost $50, and came with a double-sided floppy that contained an interactive instructional program on side one, and MousePaint (a port of MacPaint) on side two. Memories!