Address Lists/Exchange 2007

Hi folks I am trying to create an additional address list (Besides) the GAL that the entire staff can use. I can successfully create the address list in the Exchange management console and can easily view the address list from within Outlook 07.

However how do I add contacts to this address list? These contacts would be external contacts w/ no affiliation to our company. Is there an easy way to add contacts and or possibly import a contact list (CSV file or other) to this new address list?