I'm proud to announce the release of IP Camera Viewer (two versions, Basic and Pro). Get them in the channel store while they are still warm:
Basic: https://my.roku.com/add/IPCAMVIEWBASIC
Pro: https://my.roku.com/add/IPCAMVIEWPRO
Both versions fully support motion-jpeg stream, PTZ for selected cameras and basic authentication. The Pro version also provides a Screensaver which will show on the screen (bouncing from side to side - aka DVD logo) the stream from one camera and Split Screen View (multiple streams in the same time).
Also, for who is interested, in my tests I was able to connect to IP Cameras with ONVIF and decode RTSP stream. You will see those features in a future update of the applications.
ONVIF will allow the application to find and configure automatically all the cameras on your network.