It is called "Guge Pinyin".

http://tools.google.com/pinyin/index.html

My blog with screenshots:

http://www.gseeker.com/50226711/eeeieaeee_86327.php

Google中国本地化产品-谷歌拼音输入法：

[Auto-translates to "Chinese localization of products – Google Pinyin input method" -Philipp]

http://googlemagazine.blogspot.com/2007/04/google.html