about Apple's online service.
What is iCloud?
What about MobileMe?
My Apple ID for iTunes and my MobileMe login are different
iCloud, iTunes in the Cloud, and iTunes Match
Can I use iCloud with Snow Leopard?
Links to iCloud Help pages
Mobile version of 'Pertinent Questions'
More frequently asked questions
Moving iCloud calendars between 'On My Mac' and iCloud
Restoring iCloud calendars from Time Machine or other backup
iCloud and Snow Leopard
Entering iCloud email settings manually in Snow Leopard or Leopard
Entering iCloud email settings manually in Tiger
An article on alternatives to facilities which are
Missing in iCloud
File Storage and Sharing
Though not strictly part of iCloud (despite Apple's linking the two in their publicity) this article examines the differences between
Apple Music, iTunes Match and the iTunes Store.