“Startup Weekend” started up in Boulder, CO, in July as an experiment in innovation: Get together a bunch of innovative, ambitious, entrepreneurial, Web-2.0-minded folks in an office space for three days and see what kind of company they come up with. The product was VoSnap, an online social voting tool. Now Startup Weekend is coming to Boston. So far, only the dates have been decided: October 18-21. But registration is open for developers, designers user experience experts, PR people, and even cooks. Keep an eye on the Boston Startup Weekend website for more details.