Tanath on Is there a Windows program that can scan my hard drive for archive files that have been already extracted but not deleted? If not, would reddit be interested if I made one? - http://www.reddit.com/r...
"This would be easy enough on Linux with fdupes and avfs which gives a single mount point through which you can operate in any supported archives, but there doesn't appear to be a similar solution for Windows. You could boot to a Linux live disc (or dual boot) to use them though." - Tanath