There are some fine tutorials out there for using Closure Tools, but I wrote a tutorial anyhow. Go read Closure Tutorial: Displaying Friendfeed Items. Uhm, by "Closure Tools", I mean the set of recently-opensourced Javascript compilation tools and library code. The Closure library is huge, and there's plenty to explore. This tutorial shines a light on goog.net.Jsonp and goog.array.

Yes, I wrote this on a Saturday. Tech Writer's Saturday is like a busman's holiday, apparently.