I just found a bunch of files that could be safely deleted. This is the graphic of my disk usage pattern. I reclaimed up over 7GB of disk space – a lot of it in caches, old mailboxes that I had moved, and more. The WhatSize application was especially helpful, since it basically gives you exactly what you want – a sorted list of each folder on your hard drive, sorted by size of the contents, and lets you drill down and see exactly which file(s) are taking up so much space on your system. Highly recommended!