Nifty freebie tool for seeing what's on your Hard DriveWerkema.com: Software: SpaceMonger
SpaceMonger is a tool for keeping track of the free space on your computer. Each file or folder on a given drive is displayed in a box in the main window whose size is a relative comparison to all the other files in your system. So, for example, if the "Windows" box takes up 90% of the screen, the "C:\Windows" folder and all its sub-folders and files are taking up 90% of your "C:" drive
This is an unusual tool in the way it displays hard drive usage. Worth a look, especially since it is free.