Aha! I was wondering about that. I have something that uses it, albeit not for the most important part of the site/page: http://www.meteo-veneto.net (completely useless for those who don't live in the Veneto region of Italy), and I figured that was the problem, but was not sure. Thanks for posting this.

Not that big a deal, and I knew it was undocumented, so I guess I'll just go find another one. Recommendations? Needs to be accessible via Javascript.