I am currently using iRule on my iPad to control my HT equipment and lighting. It isn't just an app, but a building software that allows you to customize your control to you specific equipment. However, you do have to purchase external hardware. Global Cache makes the hardware that converts the iPad's WiFi signal of control codes into IR, Serial, Relay, etc. to control your equipment. I haven't updated or checked out the site in a long time, as I got in at the beginning and have been happy with my setup since, but I'm sure it has expanded well beyond what I know it to be. Extremely cool and, as I said, you'll have one of a kind control. If you end up using it, I would suggest getting photoshop to assist you in creating your layout. Totally worth looking at.