[gumby]

> Personally I think the extra space does improve readability. I would advocate that the extra spacing should be handled at presentation time.

Extra space between sentences is standard in English typesetting (spacing in printed text is language-specific BTW) precisely for readability: it lets you, in general, read by sentence.

The problems with deferring it to presentation are 1 - "raw"=ish text often is the presentation (consider just long text in a code comment -- and almost anything in the terminal) and 2 - you don't always write in text that is undergoing any kind of presentation processing in realtime (e.g. you're writing TeX, or Markdown for that matter). You want to be able to read it easily.

The inverse is not a problem: a typesetting system can just coalesce spacing and make its own inter-sentence spacing decisions.