Now for some blogspot stupidity.
I started off with the default setting in blogspot that carriage returns matter. Blogger would take my text and insert breaks and paragraph marks automatically. I probably should have switched this immediately, but I didn't and I went on writing for a couple of weeks with it.
But its annoying. The text edit window is already too small, so I do all my composition elsewhere, and having to re-edit it several more times to get spacing right was getting to be tiring.
So I switched over to doing it myself. Now all my old posts are munched. I'll have to go back and put [p] and [br] marks everywhere, and then re-check them. I would have preferred a "convert" option.