Yeah they've been up to something lately.. they have another planned maintenance window tonight.
Web Appss Maintenance - 02/24/2011 22:00-22:30 PT
Due to scheduled maintenance, some MobileMe members may be intermittently unable to access MobileMe applications at me.com. Members will still be able to access MobileMe Mail using a mail application on their Mac, PC, iPhone, iPad, and iPod touch. Normal service is expected to be restored at the end of the maintenance window. We apologize for any inconvenience.
System Status Recent History
MobileMe Calendar Maintenance - 02/22/2011 22:00 PT - 02/23/2011 23:55 PT
Due to scheduled maintenance, some MobileMe members may have been unable to start their upgrade to the new Calendar. Members who had already started the upgrade process may not have received an email notification when their upgrade was complete. Normal service has been restored. We apologize for any inconvenience.
MobileMe Sync Maintenance - 02/22/2011 22:00 PT - 02/23/2011 23:40 PT
Due to scheduled maintenance, some MobileMe members may have been unable to view or sync Contacts or Calendar at me.com. Contacts and calendars were still accessible on desktop applications, iPhone, iPad, and iPod touch. Normal service has been restored. We apologize for any inconvenience.
MobileMe Gallery - 02/21/2011 14:45-18:50 PT
Some MobileMe members may have been unable to publish to MobileMe galleries via email contributions, browser upload, or iPhone, iPad, or iPod touch. Normal service has been restored. We apologize for any inconvenience.
http://www.apple.com/support/mobileme/system_status_history.html