There have been a bunch of requests that I support JSONP, which I am looking into.
I understand that JSONP is needed so you can access data on domains other than the one from which the page originates. I also understand how it works in a simple case where a small amount of JSON is being returned. But I'm returning 70K of JSON text and it includes tabs, carriage returns and linefeeds.
Update: There is now a JSONP version of the river.