Not that I am aware of. One man's rubbish is another man's gold. That would be a hard app to write. It comes down to managing your own data I'm afraid. There are a few apps to help you understand where your disk space is going however, Disk Inventory X and WhatSize. Get them at:
For disk formatting and other disk related issues, such as repairing your permissions, use Disk Utility, found in the Utilities folder in the Applications folder.
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