Into the fourth dimension: Google introduces Custom Time™.
How do I use it?
Just click "Set custom time" from the Compose view. Any email you send to the past appears in the proper chronological order in your recipient's inbox. You can opt for it to show up read or unread by selecting the appropriate option.
The original contingent of Virgle Pioneers will be selected by numerous criteria, including an online questionnaire, video submission, personal accomplishments, expertise in scientific, artistic, sociological and/or political fields of endeavor, and inadequate Google and Virgin personal performance reviews.
(Hat tip: The Trademark Blog.)