The French public have rejected the proposed European constitution in a referendum. Given that the constitution requires the unanimous assent of all EU members, this means it is effectively dead. So what happens next?
Well, in a way, nothing much. The current EU system, cobbled together over the past 50 years or so, will continue. France is not withdrawing from the EU. What they have rejected is progress - in particular, progress towards tighter political integration. And they've also rejected both the process of expansion which has made political integration necessary, and future expansion to include Turkey. The problem is that neither the EU's new members or the consequent need for a better and more democratic system of governance are going to go away. This doesn't mean that the proposed constitution is the only solution, but it or something very much like it is necessary if Europe is to continue down the path it has set for itself.
Much of the rest of Europe seems to want to continue along that path. Nine countries have already ratified the constitution. It is up to them to convince the French public that the European project is still worth pursuing.