As anyone trying to grok the Reactive Extensions for .NET knows it can be a bit of a monster to get your head around.
Much of the material out there that tried to explain it doesn’t do a good job, and that’s because its not something you can understand of after a 5 min overview or a few blog posts (even a series of blog posts).
Nevertheless this talk by Bart De Smet is hands down the best resource I have found for learning about Rx and IObservable. I highly recommend anyone as a jumping off point for getting started with the Reactive Extensions.
C Is For Coder 