Space Explorer is a great file management system. It combines 
features usually found in several different file utilities into 
one easy-to-use, multithreaded, multiple-document environment 
providing information in lists (like Windows Explorer) and in
charts. As well as having several Explorer-like windows open, you can
move, copy, and rename files; create folders and shortcuts;
display folder tree sizes; find duplicate files; search for large 
files; monitor drives; and compare folders. Space Explorer supports 
drag/drop, FAT, FAT32, and NTFS (you can see who owns a file, 
its compressed size, and when it was last accessed).

Space Explorer is a great tool for standalone and networked PCs.
