This morning the lock notifications were gone, so if this posting appears, I'll assume I can post again, although Blogger didn't even have the courtesy to send me an e-mail stating that the problem was resolved.
Reading their description of how these algorithms work, I suspect the "link roundup" postings are the problem -- the robots just flag any blog that has a high ratio of hyperlinks to postings. If that's the case, since I'm not going to stop doing link roundups (they seem to be popular), I have no assurance that the problem won't recur.
If that ever happens, needless to say, I'm moving to a different hosting service. There's no excuse for locking down blogs during the two-day inspection period. Yes, send the blog owner a notice that the blog is flagged as spam and let him request a review, but leave posting open during that time. The internet will not blow up if a real spam blog is allowed to stay working two days longer (and has anyone ever actually seen one of these alleged spam blogs? I never have), but blocking posting shows a real disdain for the people that use the service.
I might move anyway. I have all the archives of this site stored on my computer and backed up on CD-ROM. I have no idea how much hassle it would be to move everything over to a different service, but obviously Blogger isn't reliable. Yes, I know some other hosting services charge, but I can afford a few bucks a month and as a paying customer I might be treated better. I'll have to think about it.