I have always loved how Gmail would add the email/contact info. of correspondents to the contact book behind the scenes. But ... sometimes Gmail would record several versions of an email address (due to spelling errors), or a correspondent would have 5 (oh yes she DID!!) addresses. That meant that I would have 5 separate entries for the same individual.
While cleaning up my contacts in Gmail (in prep for The Great Transfer), I stumbled upon the merge feature.

Thank you, Lord.