.Mac is reporting:
7/9/2008, 6pm-12am PT
As part of the MobileMe launch, www.mac.com will be taken offline at 6pm PT on Wednesday, July 9th.
Members will be unable to access www.mac.com or any .Mac services during this time with the exception of .Mac Mail accessed via a desktop application, iPhone, or iPod touch.
MobileMe will be available as soon as possible during this maintenance window.
All of your current .Mac functions should work under Mobile Me although it’s not clear what’s happening to iWeb-based pages. You should be able to add your me.com address immediately although the push apps will not be enabled until the official launch.