doesn't matter whose it is... its just a copy of google homepage, googles homepage hasn't actually changed at all, so no, google is not hacked.
Not only google, but also: http://www.yahoo.com.hz.hztop.com/ www.yahoo.com http://www.baidu.com.hz.hztop.com/ www.baidu.com http://www.0058.net.hz.hztop.com/ www.0058.net http://www.dmoz.org.hz.hztop.com/ dmoz.org
probably when google is hacked then you will see a very famous or some porn site when you will go for www.google.com
If I would be the one to hack google, I would probably sign it with my name.. be proud I say.. hehehe.
If I hack it I will not write my name, I'll just redirect the traffic to my site, like my site will be always on top That's will be a way of earning money also and not showing up for a while loooooooooooool