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FYI, new Kindle app:

Address Book (Your Contacts on Kindle) by 7 Dragons ($0.99)

Product Description
Use your Kindle as your address book with Address Book by 7 Dragons.

You can add up to 1,000 contacts in Address Book, and you can even import them from Outlook, Yahoo Mail, GMail or any source that supports VCF 3.0 format (VCard 3.0 format). You can organize your contacts into groups, and pick contacts to mark as 'Favorite' contacts. In addition to a search tool, Address Book provides a First Name Flipbook, a Last Name Flipbook to make finding any contact quick and easy.

You can make backups, and there is an automatic weekly backup to help you save your data. Address Book can export your contacts in VCF 3.0 format so you can load them into Outlook, Yahoo, Google and other VCF 3.0 compatible tools.

Address Book is your complete Address Book solution on the Kindle.