Just thought plugin developers would be interested in knowing exactly how to make their plugins use the native click-&-drag features on the "Add New Post" and "Add New Page" screens in WP 2.7. The boxes can also be hidden using the native "Screen Options" menu!
Here's a video tutorial along with a downloadable example:
http://www.techlyzer.com/2008/11/creating-click-drag-options-boxes-in-wp-27/