If you use Rackspace Cloud Servers or Cloud Files and have an iPhone, you definitely need to download the iPhone application for these platforms. It offers a very powerful set of features and options to manage your account including adding new servers, resizing existing servers, rebooting, SSH access and resource monitoring for Cloud Servers. For Cloud Files, you can easily list all of your containers and drill down on the content inside, preview content and even email an HTTP url or the file itself directly from your iPhone.
Check out this brief live demonstration I created:
See more Cloud videos on my site at: http://chadkeck.com/