That commercial wasn't Shinkai's work. Check out Icie's blog about it (Hope he doesn't mind the link!):
http://www.pireze.org/blog/?p=9867
I doubt anyone else would know more than the fan club.
Anyway, thought I'd drop by and let the Makoto Shinkai fans here know it's the first online fan organised "Global Shinkai Day" over at the Cherry Blossoms Forum if you don't know already.
Feel free to drop by and have a chat about his movies anytime within the next 24 hours
http://cherryblossomsfalling.myfastf...rg/forum20.php