I'm very interested in getting this to work with the channel and companion Android app I developed (Juice for Roku). Right now, I have the ability to playback audio and video podcasts on the Roku. If anyone can find an RSS feed pointing to live or recorded video of the Olympics, it should work without modification as long as it doesn't require authentication.
The BBC said that they will be streaming every event, but it isn't clear to me if you will need a proprietary BBC app or view it through their web site. I think this may be a better option than going through NBC since it looks like you will need to go through an NBC player to get to the video.
Even if the BBC doesn't provide an RSS feed but does provide individual URLs that work, I could create the RSS feeds and host them on my web site.
So if anyone comes across video stream URLs that will work without authentication, let me know and I'll make sure it works with my channel. Unfortunately though, this would only work if you had an Android device. If there is enough interest, I could probably create a new private channel that wouldn't require a phone app. But the key is finding the right URLs to stream the content.