I have located a suspect, his name is 陈建海(Chen Jianhai). He's NOT my friend and we have never met in person. He was one of my previous business associates because he's very familiar with credit card fraud and he advised me a lot (in terms of fraud prevention, of course) when I built my virtual goods payment processor in late 2010.
He has knowledge of my secret gmail address and I have once re-used the password in his web shop
His English is not very proficient and I'm sure that he's not reading this forum at the moment. I'm giving him a call now to persuade him to admit his wrong-doing and return the funds.
I'll post another thread soon.
Did he have an intimate knowledge of Bitcoinica business, like where the MtGox access codes were stored and what the master password of LastPass was? And another unrelated question: when was the last time you used Tor?