I've also found something similar:
http://googlesystem.blogspot.com/2006/11/google-china-shows-related-searches.html

I wonder if this is a subtle way of trying to undermine chinese censorship. They can't show search results including a phrase such as "epoch times" or "fall of communism". But by showing a related search, they are informing more people that these topics exist, and their government is trying to hide them.