I haven't been able to get Child themes to work in Carrington. I checked my utilities.php against the latest revision and all the updated child theme code is there.
The Child Theme is recognized as a child of Carrington-blog in the dashboard but it's not picking up childtheme/header/header-default.php, child theme stylesheets, or any other custom template files.
I've gone through the op111 tutorial and the hacks in this thread (http://carringtontheme.com/2010/01/child-theme-support/comment-page-1/#comment-6160) and no luck so far.