vCard

Mime-Dir and vCard Java API
A Java API binding of the IETF Mime-Dir and vCard RFCs. Project information, bug tracking, source code, and downloads.
http://sourceforge.net/projects/mime-dir-j/

RFC 2425 - A MIME Content-Type for Directory Information
Defines a MIME Content-Type for holding directory information. The definition is independent of any particular directory service or protocol. The text/directory Content-Type is defined for holding a variety of directory information, for example, name, or email address, or logo.
http://tools.ietf.org/html/rfc2425

RFC 2426 - vCard MIME Directory Profile
Defines the profile of the MIME Content-Type for directory information for a white-pages person object, based on a vCard electronic business card. The profile is defined for representing and exchanging a variety of information about an individual.
http://tools.ietf.org/html/rfc2426

vCard Overview
Discuess features and applications of vCard. (Internet Mail Consortium)
http://www.imc.org/pdi/vcardoverview.html

vCard: The Electronic Business Card
A whitepaper on vCard, the personal data interchange standard. (Internet Mail Consortium)
http://www.imc.org/pdi/vcardwhite.html