I'm head-down on the wikiriver.org project right now, but this howto was published today by by Martin Duffy at martimedia, and I wanted to be sure you all saw it.  

http://martimedia.blogspot.com/2010/12/river-of-news-consuming-jsonp-data-feed.html  

When I sent a pointer to a friend who was head-scratching through the JSON River stuff, he said this was exactly what he needed.  

I asked Martin to start a Google Group for this stuff, so that all communication doesn't have to go through me. We're at the point now where there's been enough uptake that it would probably help. 

And thanks to Martin for helping the JSON guys!  

PS: Wikiriver.org also has a JSON version, of course.