We've reported about Facebook's e-mail that's not e-mail, but I wanted to point you to a humorous piece by the Washington Post's Alexandra Petri. In it she deciphers the social significance of different e-mail services. The gist?
You know the old saying: Never trust a man with an @yahoo email address.
Learning that your prospective date still has an Earthlink e-mail is the equivalent of discovering his vestigial tail. E-mail says something about you. It says, "I can be reached here," but, like a physical address, it also carries a certain cachet. Gmail? You're probably reliable and tech-savvy. AOL? You are probably someone's grandmother. @mindspring? You probably live in a box under a bridge.
(hat tip: Ezra Klein)