Don't believe me....just check out these sources:
http://www.mla.org/style/style_faq/style_faq3 Modern Language Association (MLA)
http://channel9.msdn.com/ShowPost.aspx?PostID=112 a short film
And the hangers-on:
if you just can't break the habit, go ahead and do your ol' thing and then FIND/REPLACE the two spaces for one space throughout the document. Fix all those holes that make your document look like Irish lace!