Realtime is becoming a central part of Internet technology.
It's sneaking it's way into our lives already with push notifications, Facebook and Google's web chats, and it's a core focus for startups like Convore, Pusher, Superfeedr, Browserling, NowJS, Urban Airship, Learnboost, our own &! (andbang), and many more.
What's most interesting to me is how accessible this is all becoming for developers. In my presentation at NodeConf I mentioned that the adoption of new technology seems directly related to how easy it is to tinker with it. So, as realtime apps get easier and easier to build, I'm convinced that we're going to see a whole slew of new applications that tap this power in new, amazing ways.
We at &yet have built five or so realtime apps in the past year, and we're super excited about this stuff. We've also discovered that there are a slew of different methods and tools for building these kinds of apps--we've used a number of them. Different developer communities have been solving the same problems with different tools and it's been amazing to see how much mindblowingly awesome code has been so freely shared. However, there's still a bit of a disconnect, because it often happens within a given dev community. We always find that we learn the most when we talk to and learn from people who are doing things differently than we are.