A few months later I find that he has started a similar company, with a similar name, and is out raising money. He even said that he came up with the idea when he was 'inspired' by his young daughter. (Dragging your kids into your lie is always scummy.)
(This was for a very unusual startup idea, btw, not a game or social app, etc. I am also a recognized expert in this field, 15+ years of experience, national newspaper/magazine profiles, blah blah blah.)
He ended up getting money in Singapore and launching a pretty sucky site that got zero traction. It's been a couple years now and I haven't seen anything else from him (but I've been too busy with my company to really look).
At the time, I was LIVID but after I cooled off I realized that 1) it was pretty great external validation and 2) someone who would "steal" my idea (and make up a story about it!) would never be able to execute, and I was proven right about both things.
My company is now nearly five years old and we're working on our third product extension off the original idea. :-)