Jun 18, 2007 : Does google toolbar uses hCard microformat for addresses?

It appears the the google toolbar (at least for IE) will find addresses in webpages that are marked with the hCard microformat and use it in a "Look for Map" button. I haven't tried to test it, and I can't find anyone talking about it on the web. But it sure seems to work that way. It may (also) use some other heuristics, I don't know. Does anyone know more about this?