There has been alot of talk around the boards and email groups about spacing after a period. Old school teaches two spaces. I, unfortunately, learned on a manual typewriter and can officially consider myself old school. I didn't realize I was doing myself such an injustice. Some editors actually state in their guidelines to single space after a period.
Fandangle Online Children's magazine states clearly in their guidelines:
Make sure that there is only one space between sentences.It seems that the general feeling on this is to only use one space. I am going to take my official stand on the matter and say this:
When in doubt leave it out!