The issue does not seem to be happening as often, but it still does from time to time. It may not come up on a home page, but then it can appear when browsing through another page on the site. It definitely is sporadic, and it's affecting both of my sites, using 2 different MobileMe accounts:
http://www.globalwinetour.com
http://www.iweg.org
I spoke to Apple support yesterday, and he told me that it was the way I had the settings with my domain registrar. I looked into it, and the settings are correct. They are set the same way they have always been set, and the problem just started last week. Others are having this issue, and they are with different domain registrars (I'm with www.namecheap.com), so it is not a registrar issue. The issue comes up with both Safari and FF, so it's not a browser issue either.
I'd love for Apple to acknowledge that there is an issue here, and announce that they are aware that it is on their side and not ours, and they're working on it. That would sure be nice! We're paying for the web hosting services, and some of us use these sites for our livelihood!