It’s a great resource for beginners to professionals alike. It’s a little interactive book, that’s been around for a few years now (2010 actually) that explains how data is transmitted over the internet, what the cloud is about and how AJAX helps you in so many ways!
Yes, I would recommend you set aside a little chunk of time and go through it.
Built-in HTML 5, no flash required.
Very informative. Sponsored by Google, with a slight bias…