Apple today updated its System Status page (via 9to5Mac) to include iOS Device Activations, allowing users to check whether or not the iOS Device Activation servers are online and functional.
These servers are responsible for the setup and activation of new iOS devices, such as the iPhone 5s, and have experienced some outages in recent weeks. The System Status site tracks the majority of Apple's services, stores, and iCloud features, giving users a way to track which products might be experiencing difficulties at any given time.
The site has also recently ceased tracking Photo Journals for unknown reasons, though the feature remains active within iPhoto.