Running out of disk space? Don't know what's eaten it? Then run Disktective, to trace used-up space on your system. With Disktective you can find out the real size of your directories and distribution of used space inside them.
Each directory may contain hundreds of subdirectories each containing many files. Simply run Disktective and let Disktective create a complete report displaying the real sizes of all directories and their containing subdirectories.