Yes...and No. There are many integration systems out there (I use Bitwise Controls) that feature very, very powerful platforms for using your iphone/ipad/itouch exactly the way you would had you owned a control system that featured a tablet controller, keypad, etc.

I myself market the product to my customers and charge them for programming, equipment and network calibration. This is NOT as simple as downloading some app that asks you for your equipment and attempts to control your home theater components using some silly gadget that you keep on your coffee table or mantle that exudes infra-red. This is a system that converts IP to IR, has serial capability, temperature sensing, soon-to-come two way, very powerful programming platform, ability to create and customize GUI, and a very quick and easy way to synchronize the device with the software from a PC or laptop. Furthermore, the range is pretty much as good as your network connection which can be pretty much as vast as your wired.

So it depends on how serious you are and if you are willing to have a professional integrate your apple device control system. You can also create HTML pages and use any touch screen or non-touch screen device running Windows on it. There are DIY versions of this in using global cache, etc, but not as polished and supported.

Vincent