Generally there's nothing to get too excited about when it comes to HT gear and apps, but Onkyo AVRs are different because they can also act as an IP-to-CEC bridge (so you can theoretically control any CEC connected device through the AVR). I'm working on an app that does just that, as well as the normal app-like functions. If you're interested in beta testing please let me know.
I'm getting an Onkyo AVR this week so I would like to get a beta access to this app if possible, thanks!
Email me your live id. I just added ip control for roku and PC.