I just posted about how Twenty Ten does header images: IMHO, it does them right. I’ll soon add other posts on other features of Twenty Ten to that test blog.
I’ll also add more posts to this series on WordPress 3.0 here at Changing Way. Changing Way lives at WordPress.com, and so gets the 3.0 features as, when, and if they are folded into WordPress.com.
Twenty Ten is biggish news for WordPress.com. It’ll take over as default theme sometime soon, and it’s a significant improvement.