What's the next big thing for the Internet of Things?

Web sockets.

It's not there yet, but when it is just as common to find WebSockets in a javascript engine as it is to find AJAX functionality, and Web socket functionality is available in a larger number of backend platforms.

We will definitely be seeing a lot more real time web apps/web sites and the very nature of that could change the face of the internet quite easily I'd imagine. Heres to wishful thinking!

NFC - once NFC becomes ubiquitous, it'll be a lot easier for developers and manufacturers to integrate solutions. The problem at the moment is that we don't have critical mass of readers.

I think we're still waiting for the first big thing.