Feel free to post comments again.
Here’s what they had to say about the issue:
This has been sorted out. We’re continuing to investigate the root cause and why our monitoring didn’t catch it sooner, but Blogger is back to functioning normally. Posts made from now on will be saved.
I’m very sorry to say that, if your blog was on this database, posts and template changes made in the last 18 hours or so were not saved. They may appear on your blog now, but will disappear if you republish. If you made a post between Friday afternoon and now, we suggest that you look at your list of posts (“Posting” tab, “Edit posts” sub-tab) and compare it with what is published on your blog. If posts are missing, copy them from your blog pages before you republish.
Major apologies to those of you who were affected. We work hard to maintain Blogger as a trustworthy place to keep your writing, and we really hate to let you down.