Before I send an email, I want a button next to spell check that says “emotion check”, when I click it google grabs the words and phrases (+ some historical sets) and computes:
2. The relative negative/positive tone of the email to all emails sent by all people (0-1 scale)
3. The negative/positive tone of the email relative to emails I send to that person (or that person receives)
4. Most impt: the expected response rate and time to respond.
5. The expected negative/positive tone of the response.
I bet you could pull this stuff out using: words and phrases in the email, the recipient, gender?, ethnicity?, historical emails sent and responses, etc.
Cap it with a suggest function (a la spell check), that tells you to add a smiley face here or there, or switch words/phrases.
Eventually, get to a “health” meter next to all of my contacts showing the imputed positive/negative stance of our relationship based on message flow, I like it. Time for Gmail Labs to get crackin’.