I am using a plugin by Scott Reilly; and its called: Hide/Cut Post Text; and I think it would be great if wordpress implemented this sort of option for the admin area; where in the "write" area you would have an option(as a quick tag) to show or hide certain texts/ inside the post from being viewable to any unlogged/unregistered users.
And i think the cut feature would be amazing too! Instead of using the "MORE" option in the "write" area you could use a "cut" function that would work in replacement of the "MORE" option.
That's my idea that I would really love to see
Wordpress add on to 2.2.