Here I go...

As soon as I post this post, I will begin the changeover to Blogger Beta. Hope I don't lose...everything. Wish me luck!

UPDATE, 13 minutes later: No, I guess not. The option of switching is not available at the moment. There's an explanation on the relevant Blogger page - buried, as usual, under tons of hype and obsolete information.

Update, 12/20: If you don’t see the “Switch Now” button on the homepage, it’s because a ton of people are already switching to the new Blogger, and we only let so many run simultaneously in order to give everyone a good experience. Just log in to old Blogger for now, and we’ll give you a heads up on your Dashboard when we’re ready for you.

Not exactly the most reassuring thing in the world - "we only let so many run simultaneously in order to give everyone a good experience"? - but at least it's an explanation. I'll try to upgrade next time I'm given the opportunity.

UPDATE 2, 6 hours and 45 minutes later: Still nothing. And the update of X-Cleaner I just downloaded doesn't seem to be working. Now, let's see if AVG's anti-virus update will similarly fail...