Not to mention, as I understand it, there are some pretty strict rules about how you a company is allowed to solicit investments, and the Kickstarter format would be in violation of approximately all of them.
I'm sure there is some bright attorney who could figure a way around it (ie. its an unsecured loan, that contains a very permissible default clause, which is potentially convertible to an equity share upon event a, b, c happening). Or more simply, just host the site in Hong Kong or somewhere and escape US jurisdiction.
I know that none of this will never happen, just talking out loud....honestly, the first time I heard about Kickstarter, I thought this was the idea and I was excited. Then I discovered it was "act like a angel investor, fund my idea, and if 1000 things go right you will get a free tshirt". Meh.