It seems that we are increasingly moving to a world where only one space is used between sentences. I hate this. I absolutely cannot accept it. I find it so much more pleasant to read sentences separated by more space than mere words.
Apparently it's correct to have about 1.5 spaces between sentences, and I think that that's sufficient. But, I can't easily type 1.5 spaces. I've read that some typesetting system (probably TeX) does 1.5 spaces by default, whether you actually type one or two, and that would be lovely. I'd love to see Word and Internet Explorer and Firefox and Avalon have options to automatically control how many spaces are shown between sentences.