Ustream is one of the first live-streaming services and so their iOS app taps into a wealth of resources, broadcasters, and broadcasting tools for efficient live video recording and streaming. The Ustream app is designed to bring as many of the full Web-based tools offered by the service to your phone as possible, and while it isn't as robust as the Web-based tools, the app does a great job of making the most important tools as accessible as possible.
When you open UStream for the first time, you are greeted with numerous menus for browsing the library, from the featured home-screen content to currently live featured content, categories of top shows, and search buttons. You can also view alerts from the system, as well as anything you've added as a favorite or recorded. At the top of the screen at all times is a recording button. You can record locally whenever you want, but to record live you'll need to be logged in, which is easily done with the tap of a button. From there, it will start streaming your feed to a URL associated with your account. Inviting users is easy, as well.
Despite not offering quite the same high level of performance or seamlessness in design of the Web-based Ustream service, this app is incredibly impressive. From recording quality and speed to integration of other tools, it is a perfect toolkit for anyone that wants to live stream events with their phone or tablet.