This is one of those programs that I take for granted these days, so I didn't think about posting it here until now, but it is one of the most useful freeware programs I have ever found. WinDirStat analyzes your hard drive, and displays both graphically and numerically where your largest files and directories are. I just used it on a laptop at work and found a 15 Gigabyte temp file that needed to be deleted! You can remove files right from the GUI and then refresh the display to reflect the removal. It runs well as a portable too, so I keep a copy on my USB drive. Try it here.
