I came across Odoplus today which is a bit like WhatPulse for a mouse. It tracks how often you use which buttons on your mouse and where. According to the site:

Features: 

• Tracks overall and intermediate distance
• Click counts for left, right, center buttons
• Now supports wheel mice!
• Graphical click distribution view
• Only needs about 500K of your RAM
• It's Freeware

If only it'd tell me how many calories I'm burning by operating my mouse