We've been using Socket.IO for years. It works well. Here is a Space Invaders demo we put together a couple of years ago. <a href="http://www.webdigi.co.uk/fun/space" rel="nofollow">http://www.webdigi.co.uk/fun/space</a><p>Socket.IO let's you control space invaders on your desktop realtime mobile browser with websockets, long polling, etc.