hi! I wrote to the list a few days ago looking for an IOS App that would control and identify DLNA compatible devices, I found one and its just called "Controller", typing DLNA into the search box of the Apps Store will locate the App.
The App is available for free and is mostly accessible though I did label a few buttons of the App to make it more usable. I have several DLNA devices on my home network here including my SangeanWRF28D multi function radio, my Denon AVR2113 Suround-Sound receiver and my Pioneer Wireless Music system in the kitchen, being able to control my Wireless Music System - what it plays and how it plays - from the iPhone using DLNA was something I'd been trying to do for ages, the Pioneer Music System I have is an older model which isn't supported directly via the Pioneer Controller App it seems. I'll place a manual up for this system so those who are interested can take a peak. As I said, its an older model but is going quite cheap on eBay, certainly worth the $150 I've seen it for. The system offers many functional features inclding DLNA compatibility obviously, AirPlay streaming, direct Wi-Fi access for those times when you're not in range of a Wi-Fi network etc. One of the nice featurres I like about the Pioneer System is its IOS connectivity, the IOS device doesn't sit in a dock, rather it connects to the System directly using the charging cable that comes with your IOS device and that's a far better idea in my view because it means that the System will work with whatever IOS device you have, wither it be an iPhone 3GS or the latest 5S, an iPad of any generation etc. I have concerns about IOS docks, some of them are extremely flimsy and break easily so the problem is solved by the USB connecting lead arrangement.