There are many different approaches to keeping your email inbox under control. Personaly I always try to answer emails as they arrive as I fear that if I let them stack up I will never answer them.
Today I was pointed to a slightly different approach, although perhaps recipients of my email replies might feel that I have always used it.
two.sentenc.es
"Treat all email responses like SMS text messages, using a set number of letters per response. Since it’s too hard to count letters, we count sentences instead."
Yes, I know I said that creative domain names were a bad idea but in this case I am prepared to eat my words.