I've seen all kinds of Apps that will turn your iDevice into a remote of some kind. I've reviewed a few in the past. In this case Logitech aims to turn your iPad, iPhone or iPod touch into a Universal WiFi remote. The problem is that the iPhone doesn't have an IR port and most likely your TV, Receiver, Bluray player, etc. weren't designed to be controlled via WiFi. To get around this hardware limitation Logitech sells a small piece of hardware called the Harmony Link (see my review here). The Harmony Link is the bridge between your WiFi network and your IR controlled devices. Once you have the hardware setup then you can head over to the App Store to download their Free Harmony Link App.
Harmony Link for iOS has some great features
First off this is a Universal App taking advantage of iPad and iPhone/iPod touch screen sizes. As you might expect the experience on the iPad is visually more compelling simply because there's more screen real estate. However, having a Universal WiFi Remote in your pocket is pretty cool too. One problem this App solves is one that I've had with every other Universal remote that I've tried and that is the ability to rearrange the buttons to your taste. You can even eliminate ones you never use. For example, if your TV has a Picture in Picture feature, but you never use it and don't even have it setup, then why have that button on screen taking up space? Since this solution works via WiFi there is no reason to point your iDevice at your TV setup. This also means that you can turn stuff on before entering the room or turn stuff off that someone (we won't mention their name) left on.
The Harmony Link App on the iPad provides additional benefits like a visual guide. It's pretty cool to "see" what's on TV at any given moment and then with the tap of an onscreen button your watching that show. Also since the iPad screen is larger you get almost all the buttons for all the devices of an Activity on screen at once. For example, I can control my TiVo and TV at once. While this works great, I do wish that there was some DVR integration here. I'd like to tap a "Record/Schedule" button without having to go to my TiVo App. However, unlike the experience on the iPhone and iPod touch you can't easily change the button layouts.
The Bottom Line
While this isn't an App Only solution, it is probably the best one out there for control a variety of different IR based audio and video gear. I'd like to see some additional customization features and the ability to sync the current status of the Harmony Link between mobile devices. Otherwise, the Harmony Link works as advertised and let's you put away all those remotes you've got lying around.
You can get the Harmony Link device here.
You can get the Harmony Link App for Free from the 
