Apple has finally launched their MobileMe service at Me.com. The web-based service replaces .Mac and offers web-based email, calendar, addressbook, online storage as well as sync services. Apple has also released an update to their Apple TV to version 2.1 that incorporates MobileMe support as well as iPhone/iPod touch Remote capabilities.
Apple also released iTunes 7.7 tonight, which is required for MobileMe.
One final Mac OS X MobileMe Updater should become available through your Software Update shortly. One forum user had found the download link for the MobileMe updater which replaces all instances of ".Mac" on your Mac to "MobileMe" and also updates the Mac OS X Mail client.