With  Recycle Bin now available I may now be able to get a job in Active Directory, as it provides recovery form the sort of finger trouble I occasionally suffer from.  To use it you need to turn on the feature and this ironically cannot be undone, as it changes the way deletes are handled from this

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to this..

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My screencast on the subject is here..

Note your forest functional level of Active Directory needs to be at the Windows Server 2008 R2 level for this to work

For more detail on the active directory recycle bin and a simple step by step guide please go to TechNet here