Contacts Tool allows you to:
1 - Manage groups (create/delete groups, assign/remove contacts to/from groups)
2 - Transfer the entire AddressBook or selected records via WiFi or 3G to another iPhone/iPod and import the records on the receiving device.
3 - Save your address book to a file for backup.
4 - Create a HTML file (including contact photos) or a text file with selected contacts or the entire address book.

More information:
AppStore link: Contacts Tool

Main screen: