it would be helpful to have a trigger when a new contact is created. All sorts of actions may be useful out of this - create a file, send an email etc. I would use this with an Excel Spreadsheet that I and some customers use.
Not only for creation, but in general for all CRUD operations on contacts we need triggers. It just doesn't make sense not having them as there are so many cases where they could be used with 3rd party address books, Dynamics CRM, SharePoint and so on.