...The bad news is I didn’t find it magical-
   while Google’s voice feature understood my 
   queries more often than Siri did, it still 
   made several mistakes, and it often failed 
   to give me useful answers.
   [...]
   But the best thing about Google Voice Search 
   is that she’s overflowing with knowledge. 
   Many times she’ll answer your questions with 
   exactly the right answer. Other times she won’t 
   speak but will at least give you a search page 
   full of answers, almost always correct ones.
   [...]
   Last week I met with Scott Huffman, 
   one of the engineering directors on 
   Google’s search team.