Setting attributes with set QADUser
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http://dmitrysotnikov.wordpress.com/2007/07/25/set-any-ad-attribute-with-powershell/
Set-QADUser jsmith -ObjectAttributes @{l=’New York’;description='Reallocated Jan 1'} ## changes city and description
Set-QADUser ‘mycompany.com/usersOU/User1′ -objectAttributes @{otherTelephone=@(’555-34-67′,’555-34-68′)} ## Sets multivalued property
Get-QADUser -ReturnPropertyNamesOnly -IncludeAllProperties ## Get the list of attributes