After reading the story, I headed over to the official website, http://www.parkingday.org/ and got tickled reading all about it. They have a map of the Bay Area to check out all the parks for the official day, and links to Park(ing) Day sites around the world. For even more informaion the Trust for Public Land had a very informative site.
Checking out Flickr lead me to some great pics by Stewf
And Laughing Squid
A quick perusal of YouTube.com lent this quick clip from Paddington which is amusing to watch. There's lots more that are more informative but didn't make me giggle.