Brooklyn-based start-up Kickstarter “uses the Web to match aspiring da Vincis and Spielbergs with mini-Medicis who are willing to chip in a few dollars toward their projects. Unlike similar sites that simply solicit donations, patrons on Kickstarter get an insider’s access to the projects they finance, and in most cases, some tangible memento of their contribution. The artists and inventors, meanwhile, are able to gauge in real time the commercial appeal of their ideas before they invest a lot of effort — and cash.”