I wonder if you've had a chance to test this plugin against WP 3.1 yet? I am having a problem with the drag-and-drop function with a default install of 3.1 RC2, using the default theme and no other plugins. The error I get is
"Uncaught TypeError: Object #<an Object> has no method 'replace'"
Other than that, things seem to be working great. Thanks again for such a great plugin.