I attended the work shop put on by Event Apart Seattle to update my skills in this area.
I am particularly interested in using the video and audio tags for my mobile websites.
As for CSS3, I am already using the border radius feature – although I am relying on jQuery for that as it will handle trident base browsers (IE). I also tried using text shadow to a nice effect on a website I am developing. And added RGBA with a transition to my website for content links.