This is rubbish, I've been responsible for the whole sponsorship side of the conference since day one, to say that stolen money was used for the conference is wrong in every way, unless you're calling me a thief.
http://www.bitcoin2012.com/sponsorship Intersango is listed at the very top of the page as a sponsor. It's personnel are heavily implicated in a massive bitcoin theft. Therefore it is concievable that if their guilt is proven, stolen funds may have been used to pay for the sponsorship.
BB.
They were sponsors since February when the planning for the conference began, before there was any involvement with bitcoinica.
There is no chance of any stolen funds being involved with the event.