I'm pretty disappointed at the lack of the ability to create a screencast. You'd think with all the best developers working at Google they would figure out that a new OS would require the ability to make screencast tutorials.
You can make screenshots on ChromeOS, you figure its not hard to make 15 screenshots / second with audio. I hope to see this feature soon or at least an extension I can add.
In the meantime, I'm waiting for Remote Desktop to include ChromeOS so I can use my desktop to make a screen cast in full screen mode.