Google Maps APIの現行のバージョン情報を掲載しているサイト

The Javascript Maps API is updated approximately once a week. For information on versioning, read this section of our documentation: http://code.google.com/apis/maps/documentation/index.html#API_Updates

This is the official changelog. An alternative developer-contributed changelog is here: http://mapki.com/wiki/Changelog

Current (v=2): 2.184

Latest (v=2.x): 2.192

Stable (v=2.s): 2.140

via code.google.com

なかなか見つからなかった

via ひひーん！