If you are still using the MobileMe instead of the latest iCloud you have to migrate now from MobileMe to the iCloud. As it was announced by Apple that the MobileMe will be replaced by the iCloud. Now if you visit the me.com site you will get notice of its closure but with the provided links you can still copy your images from gallery, download your files from iDisk and move your MobileMe account to iCloud.
Also you are given the link to find a lost iDevice. So I recommend to create or migrate to the iCloud as soon as possible to enjoy the full benefits of cloud computing / technology on your all iDevices.