Apple today announced Q1 2013 financial details. During the earnings call, Apple also announced that iCloud now has over 250 million users using the service. Back in October, the company reported that it had 190 million users and this latest reports clearly indicates the widespread use of the online cloud based service.
Most of the Apple Apps already work with iCloud and even developers have started to include iCloud within the applications to sync data. User data can always be accessed via iCloud.com.