See
http://googleblog.blogspot.com/2011/06/knocking-down-barriers-to-knowledge.html

you are getting slower and slower ;)

Hah! The example given for "search by speech" is to search for
[translate to spanish where can I buy a hamburger]

That search probably worked correctly yesterday, but today it returns dozens of copies of Google's announcement instead of a translation.

http://www.google.com/webhp?hl=en#sclient=psy&hl=en&site=webhp&source=hp&q=translate+to+spanish+where+can+I+buy+a+hamburger&aq=f&aqi=&aql=&oq=&pbx=1&bav=on.2,or.r_gc.r_pw.&fp=2e70ba65e59f7e5c&biw=1400&bih=756

Actually, the search sometimes works, sometimes doesn't.

http://en.wikipedia.org/wiki/Google_Voice_Search

Also
http://www.google.com/insidesearch/press.html#blog%7COfficial

(via English-language Wikipedia)

And
http://m.cnet.com/Article.rbml?nid=20071174&cid=null&bcid=&bid=-93