For the past few weeks we have been working on a module called Aegir Network.
Aegir Network allows Aegir servers to communicate with each other. This means you can centralize information from different servers, and run tasks on remote sites and platforms. It also adds a server overview UI to the Aegir interface.
In short, if you're running multiple sites and platforms across multiple servers, and you'd like to manage them from one central dashboard, you should probably check out this module.
Aegir is particularly well suited to creating Drupal software-as-a-service services, since you can install it yourself on your own server and manage it independently. This article shows you how to do that.
I can no longer imagine using Aegir regularly without the Hosting Queue Daemon. For those who aren't aware, this was a contrib module (hosting_queue_runner) for the 1.x version of Aegir, but improves the user experience so much that we've moved it into core for the 2.x series.