Coincidentally on the same day, June 6, 2011,  Apple announced the new iCloud together with the termination of MobileMe. If you had an active paid or trial MobileMe subscription as of June 6, 2011, your service will automatically be extended through June 30, 2012, at no additional charge. However, if you choose, you can cancel your subscription at any time for a pro-rated refund. For those that might want to cancel the subscription, below are the steps for backing up and canceling.

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How to Backup :

Data that you might be considering backing up are Mails, Contacts, Calendars, iDisk. After reading their detail instructions, it seems Calendars seems to be the most trickiest. Details of how to backup each data sets before cancelation can be found here

How to cancel :

To discontinue the free Find My iPhone service, turn off the application on each ofyour iOS devices (iPhone, iPad, or iPod touch). You can do this by tapping Settings > Mail, Contacts, Calendars > MobileMe > Find My iPhone.

For more information visit

http://support.apple.com/kb/HT4597

http://support.apple.com/kb/HT2174