If you are looking to get to grips with the basics then you should check out:
The following provide you with everything you need to build common realtime components in minutes.
This tutorial shows how progressively enhance a blog commenting system into a real-time engaging experience where you’ll see a comment made by one user instantly appear to every other user viewing the blog post.
This tutorial shows how create a dashboard that displays SMS and incoming call notifications, triggered via Twilio WebHooks.
This tutorial shows how to create a realtime location aware visitor tracker for a web site or application. When a visitor navigates to the page on your site, or accesses your mobile web app, the visitor tracker will display the new visitor hit in realtime, displaying the page they've landed on and where each visitor is on a Google map (lat/long and locality).
Adding realtime functionality to applications has often seemed difficult due to the connection limitations web servers but it can actually be achieved fairly easily by offloading this component to third party services like Pusher. In this tutorial you'll be shown how to build a simple e-commerce application that displays realtime stock levels to the customers.
This tutorial shows how to build a "Who's shopping?" widget which can show other users who is browsing the same product as them and that interest in the product they are viewing is high.
We wrote this tutorial for the August print edition of .net magazine. It's now arrived online. It covers how to create a Realtime survey using Ruby on Rails and Pusher.