If you have already checked the HTML 5 capabilities then you should already know that HTML 5 isn't just about tags. Major part of it is about new Java Script APIs that enable us various capabilities such as getting geolocation information, interacting with Java Script code running in other windows and using the web browser for storing data as if it was a small database.
Now, that Microsoft took its decision about HTML 5 as the major technology for RIA development it is clear that we should all master the Java Script programming language.
I have recently completed to develop a detailed course that teaches how to develop code in Java Script. The community version is available for free personal and academic usage at www.abelski.com. The commercial professional version is available at www.xperato.com.
Please don't hesitate and let me know your thoughts. I will be more than happy to get your feedback.