Hi Jonathan, I got a problem with the current beta and your plugin.
The first post note don't got the tinyMCE controls,
tinyMCE is not defined
tinyMCE.execCommand('mceAddControl', false, 'post_notes_copy'+i+'');
post-notes.js (Linie 209)
The way I fixed it was to change the line 209 to:
jQuery(function(){
tinyMCE.execCommand('mceAddControl', false, 'post_notes_copy1');
});
in the post-notes.js file. I bet the is a smarter way for that!