You may know "Google Reader" - kind of online RSS reader - are providing publishing feature for your labeled and publicly opened feeds. You can copy the code and paste it to your blog.
For example, this is my feeds about web 2.0.
If you can check the source HTML code of this page, you might notice that this is some kind of JSON with padding (JSONP) call. Actually, you can check what feed data is sent from Google via following URLs :
http://www.google.com/reader/public/javascript/user/03853986730064725171/label/web2.0?n=5
http://www.google.com/reader/public/javascript/user/03853986730064725171/label/web2.0?n=5&callback=hello
The most intuitive way to see the JSONP services, I think, is to use my JSON with Padding Tester. Arbitrary JSONP services (including Yahoo, del.icio.us, or Amazon with xslt) can be visualized using this tester. Of course it is useful for this Google's JSON service.
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