Email etiquette: Do you cap?

As an English major in college, I may be sensitive to the etiquette of the written language. In the Stone Age we communicated via handwritten letters. We advanced to typing our thoughts on paper. Now we've discarded the paper and instead blast our words into cyberspace.

So what's the proper etiquette for this new medium?

Shall we bother with rules of punctuation, grammar and capitalization?

Or rather dash off our thoughts via the 21st century version of Morse code?

We increasingly shortcut our communication as a function of our sense of time. The less time we perceive we have, the more quickly we want things done and the less time, effort, and energy we wish to invest in each undertaking.

We no longer make the effort to press the shift button.

We don't have the energy to make a phone call.

We dare not take out time to sit with a loved one and relax or play.

Where did all the time go?