Hi,
Since lots of people have been posting on
http://forum.bitcoin.org/index.php?topic=20207.0 let me give you some infos too. The cat is out, so let's just as well put as much infos as I can. Kevin asked publicly me to reply, so here is my reply response.
Kevin has no buy order as of the day preceding the attack. Now, he bought 258k bitcoins at 0.01 USD per bitcoin (0.0101 if you include our 0.65% fee).
Let me show you the login logs for our hacker guy on his account full of bitcoins, and Kevin:
[2011/06/19 05:00:02] Hacker login on hacked account
[2011/06/19 05:12:10] Kevin login on his account
[2011/06/19 05:15:10] Hacker login on hacked account
[2011/06/19 05:15:36] Hacker starts selling
[2011/06/19 05:22:35] Hacker login on hacked account
[2011/06/19 05:45:39] Hacker login on hacked account
[2011/06/19 06:08:18] Hacker login on hacked account
Kevin had only one chance that day to place his 0.01 buy order. So either he had a lot of luck, and somehow knew it was the right time to place a 0.01 buy order, or something smells fishy in there. It's not up to me to decide, but I will report this as it has become a public matter.
Therefore I choose option 4:
Option 4: Mt Gox signals this to the competent authorities
+ We are safe
+ We may even have a chance of catching our hacker if Kevin knows him
+ We can rollback without having to worry
- Having to deal with FBI, provide logs and proof