Instead of seeing their settings when accessing the MobileMe online accounts page, many users saw a message saying “MobileMe Account is currently unavailable.” The Account page is where MobileMe subscribers go to access the new Find My iPhone feature.
Find My iPhone is a new feature for iPhone OS 3.0 users that displays their iPhone’s physical location on a map, and also lets them send a message to the phone, play a tone, and remotely erase their data if the device is lost or stolen.
The accessibility issues are likely a temporary problem and will subside once fresh iPhone updaters finish trying out the feature, which is probably a good indicator that users should try to avoid losing their handheld over the next few hours.