When I was in Nantes this summer, I kept seeing subtle little details that made me think something interesting was going on. Compagnie La Machine (with its multi-story robotic spiders http://www.lamachine.fr/) seems to be surrounded by a maker scene, and even perfectly ordinary magazine shops carried Open Silicium (http://www.opensilicium.com/) a really nice embedded systems magazine that covers advanced hobbyist and professional concerns. This is a lot harder core and more specialized than the Linux Journal, for example, and when I've shown it off to US booksellers specializing in "maker"-related publications, they just about drooled.
Combine that with the French startups I saw at La French Touch in New York a couple of years ago, and some of the recent legislative changes the government was supposedly working on, and I kinda wanted to hang around and see what was up. I have a sneaking suspicion that the French have all the raw ingredients for an excellent startup scene, but that funding might still be something of a struggle.