Vyooh DiskView 

With DiskView add-in to Windows Explorer, you can manage your disk space wisely, and organize your files & folders without stepping out of Windows Explorer. DiskView helps you find big files at a glance, and visually shows how disk space is organized
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Harddisk Search and Stats 

Freeware file and disk search engine. Searches folders recursively (optional), can use multiple search-phrases, filter search using file extensions, use internal or external file viewer, import file types, filter and sort on file date/size, etc.
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Absolute CHAOS 

Encrypt text files, programs and entire folders giving additional security to your information.
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Context Magic 

Context Magic is a Windows Explorer context menu extension that greatly extends functionality of the standard Send To menu and allows to manage files and folders with a few mouse clicks.
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MailNavigator 

An email and news client with a powerful information retrieval tool for the mailbox folders of the majority of popular mail programs: MS Outlook, Outlook Express, Netscape, Eudora, etc..
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FileTiger 

FileTiger 1.3 Dual-Window Synchronizer and backup tool for 32-bit Windows(XP, Me, 98/SE, 2000). Emphasizes speed, by providing two folders side by side, for moving, copying, backing up, and getting organized. From Science Translations Software.
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