The contents might have changed over the past 10 years.
Where there was Fax you might now find Instant Messaging or Skype info.
An e-mail address is a must, depending on how 'always on' you want to be a mobile-cell phone number will be displayed.
You might juggle various identities such as corporate and non-profit or maybe as an employee and a start up person in tandem so there might be value in having more than one card depending on what crowd you are with at a certain time.
Then there is the matter of style (embossed or not, colorful, zany) and language (add braille, or Chinese or Japanese or French to the first offer).
Thanks to Rhymer Rigby Play your cards right column (FT, April 27) for the inspiration.