By request (see this thread), an address book has been added.  Address books will be contained in the user profile, located in My Account. Profiles are private so they are only viewable by relatives.  Currently the profile includes the following:

• Physical Address
• Voice contact information (phone, fax, cell)
• Instant Message Information (IM, Yahoo, MSN, etc...)

If you would like to see other fields available on the profile page (such as occupation, hobbies, etc...) please comment below.