Urgent message? Don't use e-mail.
Scott H. Young has posted a great list of "The Seven Bad E-mail Habits that Make People Want to Kill You." My favorite is one that goes smack-dab against conventional wisdom:
My guideline is that I shouldn’t send an e-mail if I need a response in less than five days. Not only do some people take days to respond to e-mails, you won’t be able to convey urgency in text. When you are on the phone or in person, you can transmit the impending need of your request, while in text you can only resort to using CAPITAL LETTERS or exclamation marks!
Thanks to Lifehacker for the lead.

I think that's good advice, but I do have a nit to pick: why does the author think that you can't convey urgency in text? Writers - even average writers - have been conveying urgency in all kinds of documents, from letters to memos to articles, for many years now.
Posted by: John Whiteside | 28 November 2007 at 09:01 PM
I may in the minority, but I totally disagree. Maybe it is because I am a tech person who is by the computer all day, but I and many others view the phone as an interruption. Plus, it is often helpful for both parties to have a written record of requests.
Additionally, I don't consider 5 days urgent. Urgent is for under an hour. I would love to work in an environment where 5 days was considered urgent.
Posted by: Michael | 29 November 2007 at 01:52 PM
The art of communication is quite an interesting topic. I completely agree that verbal urgency conveys the message much clearer than through text.
http://www.vigorouswriting.blogspot.com/
Posted by: Jesse | 03 December 2007 at 05:05 AM