Display Size of every Folder in Windows Explorer Itself
Folder Size is a freeware that adds a new column in your Windows Explorer to display the size of files as well as folders. For XP and Vista.
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New Amazon S3 Client for Windows – CloudBerry Explorer
CloudBerry Explorer offers an FTP like explorer interface to manage files hosted on Amazon Simple Storage Service S3. The free client lets you ork with any number of Amazon S3 accounts simultaneously.