UPDATE: Apologies. I jumped the gun here. The article should have been headlined “MobileMe shows random signs of life”. It sputtered into life from time to time last night, but only long enough for me to grab some of the screenshots below.
MobileMe is live. Check it out for yourself at me.com 
UPDATED UPDATE: Nope, gone again. This is too much for my nerves!
UPDATE: All good again! Go for it.
Well, it was live for a moment, long enough for me to grab the screenshot from my MobileMe Account page above. Now it’s gone, and the URL redirects to Apple’s MobileMe Promo page again.
In order to use it you will need to fire up Software Update first and download the MobileMe update that’s waiting there.
The update changes the icon in System Preferences to the new MobileMe one. And probably does more important things too. For example, it requires you to quit Mail.app before continuing, so it’s making some changes there as well.
More details if and when it revives itself again.
Hopefully, it was launched a little early, and is not quite ready. It didn’t look like the MobileMe Calendar knew about my CalDAV calendars.
UPDATE: Still doesn’t know about my CalDAV calendars.
And there’s bad news in the MobileMe Address Book Preferences for people who don’t live in the USA, France, Germany or Japan:

In answer to Harry’s question in the comments, it looks like the personal domain option in the Account Preferences only relates to web hosting, not to email:

But I can’t test that.
Tags:
Address Book,
Apple,
Apple Mail,
dotmac,
frustrating!,
iCal,
mac,
mail.app,
mobileme