If you want this for streaming video, forget it. The iPhone/ipad can only play mp4 natively and youll need a transcoding UpNP server that can transcode to mp4 on the fly. I say forget this and look at AirVideo instead if you want to stream video alone.
Beware: this app is packaged and sold as 2 different apps for the iPhone and ipad. I thought after buying and installing this on my iPhone the ipad app would be free, but I ended up paying twice for essentially the same thing. I think the author does that by design to soak you. Air Video is designed for both and ray only charge you ONCE.
BruceReed about PlugPlayer, v3.4.0