Two Spaces or One Controversy Resolved?

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Ok, a lot of debate on if you should use two spaces after a sentence when typing or one space.  Read this post and comments to get caught up.  We may have found an answer. 

Margo (one of the proponents of one space) sent me this answer from about.com:

"It is generally accepted that the practice of putting two spaces at the end of a sentence is a carryover from the days of typewriters with monospaced typefaces. Two spaces, it was believed, made it easier to see where one sentence ended and the next began. Most typeset text, both before and after the typewriter, used a single space.

Today, with the prevalence of proportionally spaced fonts, some believe that the practice is no longer necessary and even detrimental to the appearance of text.

The Bottomline: Professional typesetters, designers, and desktop publishers should use one space only. Save the double spaces for typewriting, email, term papers, or personal correspondence. For everyone else, do whatever makes you feel good."

Whichever way you have been taught, it would be hard to break the habit. (two spaces) Can we all agree to disagree?