To Email my Information:
1) In the Contacts application, highlight the Contact(s) you wish to send your vCard to.
2) Select the Actions drop-down menu and Email My Information. Select whether you wish to send you Personal, Work, or All information.
3 ) A new email will automatically attach your information and the Contact's email address.
To Automatically Append a Vcard to your Outgoing Emails
1) Click on Preferences> General Email settings
2) Under Composing Emails you will see an option to 'Automatically Attach Contact Info'.
3) Select the information you would like sent (Work, Personal, All)
4) Click Save