I think all of the iPhone/iPod touch/iPad remote control solutions are going to come into their own more so when iPhone OS 4.0 comes out where the WiFi connection doesn't need to be re-established, and the program can have "some" background abilities, etc.

Plus, there shouldn't be just ONE iPhone using the remote control software in a house where there is more than one person. Throw in an iPad and an iPod touch or two for the others. In fact, I doubt I'd use my iPhone at all. Either use an iPod touch, refurbished, 8 GB, or an iPad. No phone calls to worry about mucking up your HT/HA experience.