We all know that WordPress 3.0 release with a new default theme Twenty Ten and one of the interesting feature is that you can build a Twenty Ten child theme that inherent the parent theme features. There are 4 Twenty Ten child theme that I really like it.
What make it interesting ? The Docout Twenty Ten child theme restructure the document outline and hierarchy of twenty ten, this will improving the SEO of the blog because the new structure will be better read by search engines.
What make it interesting ? The Speaky Child Theme is release by wpbeginner , it included all the features of twenty ten , on top of that it added a featured post slider.
What make it interesting ? strictly speaking this is not really a child theme, what it does is customize the Twenty Ten theme and added html5 tag, so-called html5-ified the Twenty Ten theme.