There are a number of ways of delivering data in real-time but until recently it has looked like PubSubHubbub, with the backing of Google, was going to be the preferred method. However, the past couple of weeks have seen a couple of interesting developments which could indicate that the developer community may actually prefer HTTP Streaming.
Feedly, one of the most popular alternatives to the defunct Google Reader, has just announced that the Feedly API is now open to all developers. Last month, Feedly kicked off a paid subscription service, Feedly Pro, offering the first 5,000 subscribers a lifetime subscription for $99.99. Feedly raised almost $500,000 within the first eight hours.