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RSSContact

allows individuals to share their personal contact information among family, friends, and colleagues - utilizing the latest in Really Simple Syndication (RSS) technology, including RSS channel creation and aggregation. With RSSContact, you will be able to:

* Share your personal contact information in real-time with unlimited users.
* Control who sees your information. Ability to display or hide specific fields.
* Create RSS feeds that show your business and personal contact card information.
* Invite your friends, family and colleagues to subscribe to your RSSContact Channel.
* Automatically display changes and updates to subscribers in real-time.
* Create contact cards that your subscribers can import into MS Outlook (VCF Card).
* Bypass problems with firewalls and SPAM filters. Your information gets through.

(via Waxy.org)