http://apiblog.youtube.com/2010/02/new-format-for-json-results.html
I wanted to make sure folks knew about the new format we're supporting
for YouTube API responses, called JSON-C. You can read more about it
in the blog, but the quick link to the full documentation is
http://code.google.com/apis/youtube/2.0/developers_guide_jsonc.html
Cheers,
-Jeff Posnick, YouTube API Team