Take Control of iCloud will teach you how to handle many aspects of iCloud, including:
iCloud Web site: Learn what you can and can't do in iCloud's Web-based interface for Mail, Contacts, Calendar, Find My iPhone, and iWork documents.
iTunes in the Cloud: Learn how to turn on automatic downloads so nearly anything you buy from Apple--music, apps, and ebooks, though not TV shows or movies--appears on all your devices. You'll also learn how to re-download previously purchased items, and you'll read about how to start using Apple's optional, $25-per-year iTunes Match music service.
iCloud Backup: Find out what data on your iOS device backs up, how to handle your backup, and--most importantly--how to restore your backup after a problem!
Photo Stream: Having all your recent photos appear on all your devices sounds great, but there are gotchas. Joe explains how the 1,000-photo and 30-day limits work, as well as what's necessary to get a truly embarrassing photo out of your Photo Stream.
Documents in the Cloud: Start changing your habits and expectations as your documents begin living in the cloud and within apps instead of on a local disk. But beware, since Documents in the Cloud isn't always seamless, with both manual effort required and data loss possible at the moment.
Calendar and Contacts: Find directions for working with iCloud's Calendar and Contacts Web applications, along with pointers on the relatively few ways they differ from the Mac's iCal and Address Book and from iOS 5's Calendar and Contacts apps. Learn how to handle invitations to calendar events, plus get guidance on how reminders work within iCloud's calendaring system.
Mail: As with Calendar and Contacts, Joe explains how to set up and use iCloud's Web-based Mail app, which is similar to the iOS Mail apps.
Notes and Reminders: These new applications in Mountain Lion extract the similarly named features from iCal and Mail and match up with the iOS apps; Joe explains briefly how to use them to keep information synced across all your devices.
Find My...: Learn how to use Find My iPhone/iPad/iPod touch/Mac to locate a device that's gone missing, and get an overview of how you can keep track of friends and family with the new Find My Friends iOS app.
Back to My Mac: With Back to My Mac, you can connect to your Mac at home or the office over the Internet and use both file sharing and screen sharing just as though you were on the same network. Joe explains the basics.
Read this book to learn the answers to questions such as:
What are iCloud's primary features?
How do I set up iCloud-based calendar and contact syncing on my iPhone, iPad, or iPod touch?
How do I share calendars with people who are not using iCloud?
How quickly should I expect iCloud to sync my data?
How do I configure my email software to use my iCloud email address?
How do I add files to my Photo Stream from Windows?
How can I configure my AirPort Extreme to work with Back to My Mac?
What should I expect iTunes to do immediately after I turn on iTunes Match?
in Web Galleries and files in iDisk, and what alternatives you can use to replace that functionality.
What to do if you have multiple Apple IDs, shared Apple IDs, a MobileMe Family Pack, or a non-email Apple ID, and how to associate your primary email address with the desired Apple ID.
The best ways to replicate MobileMe-based group calendar sharing in iCloud, especially if not everyone you share with can upgrade to iCloud.