SlingPlayer Mobile on CHR550
FYI - I hooked up my new Slingbox Solo tonight, which is tied in to a Motorola digital PVR. Another $29 at the App Store and I have the SlingPlayer Mobile running on an iPhone 4S. With the iPhone's video out capability, I'm able to watch live TV on the 730RHR, as well as have full control of the PVR functions.
Everything works like a charm, and the iPhone App is a very easy, intuitive interface to use. Video quality is good (better than Netflix streaming) and I think I can make it better still by playing with some of the App & PVR output settings.
Audio isn't as good as I'd hoped, but overall this is a win!