The Google (NSDQ: GOOG) Android platform is officially free and available by making it available to the open-source community. Google pledged to open it up once the first phone was off the ground, and it has held to its promise, as T-Mobile USA gears up to launch the G1 in stores tomorrow. The Open Handset Alliance, which oversees the Google Android operating system, made the announcement today. But the big question now, is what’s next? In a blog post, Android wrote: “You’ll be hearing a lot about Android devices….But one device is just the beginning…This is an exciting time for Android, and we’re just getting started.  It takes a lot of work to keep up with the changes in the mobile industry. But we want to do more than just keep up; we want to lead the way, to try things out, to add the new features that everyone else is scrambling to keep up with.  But we can’t do it without your help. What will you do with Android?”

Just some of the projects that have been rumored is a social-networking phone by Motorola (NYSE: MOT), a potential phone launching with Sprint (NYSE: S) Nextel, and even today, CDMA handset-maker Kyocera committed resources to the OS. Rich Miner, Google’s group manager for mobile platforms, told GigaOm earlier today: “Now OEMs and ODMs who are interested in building Android-based handsets can do so without our involvement.” But it will likely extend beyond phones. Google is also a future investor in the new Clearwire (NSDQ: CLWR), which will be rolling out WiMax nationwide with the help of Sprint Nextel. That and other networks will allow non-phone devices to tap into their networks for Internet access.