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Thanks to John, my future roomie for this stuff:

coconutBattery v2.2
isn’t just a tool which shows you only the current charge of your battery – it also shows you the current maximum capacity of it in relation to the original capacity your battery had as it left the factory.

WhatSize
is a simple tool that allows the user to quickly measure the size in bytes of a given folder and all subfolders and files within it. You would be surprised at how many useless files might be laying around on your hard disks. The files and folders are automatically sorted by size, with the biggest sizes first.