General Discussion
In reply to the discussion: For the grammar police: One space after periods, people [View all]typography is not grammar, punctuation, or style.
Style guides for the various schools and professions will determine which typography will be required. If one requires single-space (Chicago or MLA) then you use single-space. If one does not or allows for a choice in preference (such as Harbrace or APA) then consistency is what is required. If you are doing it for personal communications that are non-professional, do what you want.
I work in several professional fields including programming and development with advanced technology. I seriously doubt any one will consider me 'not up on technology' if given a choice, I choose the typography convention that has been in consistent use for hundreds of years versus the illusory belief of typologists and graphic designers today who erroneously believe that because it is 'modern' it is 'better'.
So if you have chosen to change what you were taught, fine by me, but please do not confuse personal choice with 'right' choice.