Interesting. I usually include something of a salutation and signature – but nothing too formal (Best, regards, thanks, peace).
Of course, e-mail also often becomes a conversation (back and forth) and then salutations and signatures disappear.

Most of the time, when my emails go to multiple people, I begin the same way–
“Greetings to all:”
although when I send to a single recipient, I generally just use a noun of direct address followed by a comma–
“Scot,”
My close is almost always
“Cheerfully, o”
Although sometimes I add another verb to “cheerfully” depending on context.
I have found that the right adverbs in the close works better than including tags or any number of other ways to communicate the spirit in which the email is sent. And most of them are cheerful.

I typically don’t greet or sign, not because I am in a hurry, but because in my map, the more correct and formal a communication is, the more it is likely to be some form of mass produced ad-info which I am trained to ignore.
and my grumpy pants comment which i probably shouldn’t say …
If Americans do something different than the rest of the world, and I assume the rest of the world is backwards, then I am a tool of the cultural colonial imperial hegemony.
If I claim it is because America has gone too far and needs to return to the more organic and natural understanding held by the rest of the world, I am still re-enforcing the same view of America as the leading edge and the rest of the backwards world exists only to inform us where we need to correct ourselves.

Practicing the email version of the signature just does not seem as important as the real think. Great thoughts.
http://www.matthewmorine.com

We are going down this road deeper and deeper every year.
http://www.matthewmorine.com

I was born and raised in Hawaii so I always sign off:
Aloha,
Chris

I wrote an essay about the angst that comes with trying to decide how to end an email: http://mattwiebe.com/2008/07/on-valedictions/
Basically, the problem is that we live in a pluralistic culture in which the shared traditions that would have given these valedictions meaning have long evaporated.

I use different sign offs for different people and different purposes. Outlook lets you store different signatures so I use that feature–but sometimes I create a sign off for the occasion.
Like when I, as church treasurer, write to our pastor I sign off with “Your bean-counter for Christ”

yours,
Hank
Picked it up from a professor of mine in London. Didn’t know the guy all too well, but found his signing off strangely human and endearing.

Every business email I send begins with
[[addresee name]],
text xxxxx
and finishes with
Kind Regards,
[[my name and full email signature]]
personal emails are normally just trash-talk anyways, so formalities are dispensed with.

Usually just a hi or Hello, or their name.
As a sign off, for believers or church business “In Christ,” or “Grace and Peace,”, for other business, Sincerely, or Truly. I actually write them, rather than use an email sign off feature.
Grace and Peace,
Phil

I had an odd business salutation sent my way. A recovery company was (rightly) looking to get money back from me (which I gladly sent them), but in the request for the money, the gentleman signed it “Very truly yours”. Super weird.

ay…. I think at times I think cynically that salutations have become yet another part of our lives that has been taken over by cheesy spirituality.
I have given in as well, and when I am writing a Christian I often sign off with “In Him, Kacie”

My personal signature in my e-mails, both personal and business, is a thought-provoking quote.