If you ever wonder what your hard drive looks like, this is your chance to find out. “Disk Inventory X”:http://www.derlien.com/ analyzes your hard drive and creates an interactive graphical representation of all the information stored on it. I’ve used this program for a long time to figure out how to create more space on my iBook’s 80 gb hard drive, pictured below. It’s fun to see how your computer works, and with the great price (free) there’s no excuse to not try it out.
http://windirstat.info/ and "Linux":http://kdirstat.sourceforge.net/.