to make my wishes, i would like this to be not global, but independant... one Global Admin Notes, and one like the original, per admin...

Isn't it already like that before you install this? ;)

He means that he wants one Global, and one Personal.. :p

If I ever get to grips with OOP and the Plugin system, I might look at making some kind of switch to allow the admin to select between the "Global" notes and "Personal" notes. This will of course require a change in the SQL tables, however.

I too would like a personal and global admin notepad. Also... if I were to install the plugin, what would happen to the notes already in the admin's individual notepads?

Well effectively, they'll be lost.

In the 3.0.x version of this modification, I added a query to initially clear the individual Admin Notes just in case any errors occurred.. This doesn't do that, but the first admin to change their notes will effectively make other admins have the exact same notes, and from then on any changes made by any admin will effect the other admins too.

How hard would this be to include the mod notes too so mods can leave notes for admins?

I've updated this so Global Notes are now independant:
You can have only personal, global and personal or only global notes.

Does the AJAX Admin Notes product still work with this version now?

EDIT: I entered a Global Note and when I refreshed the page it was gone. I also tested by logging out of the Admin CP and logging back in and it was gone again. Maybe I'm not understanding how this works, but shouldn't it still be there? And I un-installed the AJAX Amin notes before testing this.

I don't think that this is compatible with AJAX Admin Notes.
And this Hack does not use AJAX, meaning you have to click Save.
But then it should work.

I clicked save and the note was there until I refreshed or logged out of the Admin CP and logged back in.