Google refused to share its search datas to the US government [1], unlike Yahoo and MSN : they apparently want to protect their user's privacy (and, perhaps more importantly, their precious datas). And they paied a hard price : Google saw its largest 1-day loss ever [2].

Now, they post their Response to the DoJ motion [3] on the official Google blog [4]. If you're really curious, you can even read the 25-page pdf file containing the entire response [5].

Refs:

• US gov. demands search data : Google says no, but AOL, MSN and Yahoo said yes [6]
• Google sees its largest 1-day loss ever [7]
• Response to the DoJ motion [8]
• The entire response here. (This is a 25-page PDF file.) [9]