New evidence shows that zhoutong is the hacker.
After Bitcoinica MtGox account compromised ,zhoutong sell LR in China.
日期:2012-7-12
Ryan(11853074) 20:03:18
Selling LR funds for RMB6.2 each, to be paid through TenPay (
http://www.tenpay.com)
Ryan(11853074) 20:13:06
I can sell whatever amount that you require (literal: I have unlimited funds)
Ryan(11853074) 20:13:12
I'm helping a friend to sell
Ryan(11853074) 20:14:06
Amounts below $10000 USD is okay.
Ryan(11853074) 20:17:18
LibertyReserve
And zhoutong's LR account is :

zhoutong said The hacker registered a Liberty Reserve account U9236056 at Jul 12, 2012 9:42 PM.
So now everyone knows zhoutong is the hacker!!!
Translated.