I'm another victim in Japan.
Have lost over 30BTCs which I need back.
Fortunately I took a screen grab of my transaction list, account number and balances. Most of my savings were tied up in Mt Gox's account.
If this helps, I will be eager to join a class action suit in Japan.
Gavin
I am exactly as you, 30BTC and I have screenshots of all my account.
Please, if you know legal movements in japan that I can move into, please let me know!
(I am from spain)