In keeping with Apple’s commitment to make iCloud more secure, Apple have just added a new level of security to iCloud.
You are now sent an email when someone logs into www.icloud.com with your account credentials. The email gives you the option to ignore it, if it was you who logged in, or the option to reset your password.
The only slight glitch seems to be with the date and time stamp for when this event happened, which currently is set to PDT.
This is a nice addition.