Looks like posting is re-enabled, after nearly twenty-four hours. According to the tech notice, Blogger somehow ended up screwing the pooch during a bit of "routine maintenance"; which resulted in temporarily losing all content from after the Wednesday data backup.
Posts are back, as is the ability to post. Comments do not appear to have been restored. I'm not sure whether they will be or not. The tech notice is rather unspecific on that point, saying only that they're working on restoring everything.
So, if your comment never returns from its tour of duty in Limbo, that's why. I'm not going through and deleting the things.
...Also interesting, is that my saved post tags seem to be corrupted in some cases. Well, all we can do is hope they restore everything correctly, I suppose...