This is another PowerShell script one of my coworkers came up with; it creates dynamic distribution lists. It can be handy to create distribution lists in AD based on location, for example, instead of manually managing a distribution list.

New-DynamicDistributionGroup -Name "123 Building" -RecipientFilter {(RecipientTypeDetails -eq 'UserMailbox') -and (StreetAddress -like "\*123 Building\*") -and (UserAccountControl -ne 'AccountDisabled, NormalAccount'))}