Sounds a bit like the MediaBird Study Notes module. However, this Portugese-made block is less complex, but simpler to install and to use.
Here are its main features:
- Assign up to THREE priority levels for each note;
- Sort notes by last modification or priority level;
- Easy visualization and edition of notes with popup windows;
- Global configuration for the length of note previews inside the block.
- Install the block as normal.
- Copy the file block_mynotes.php to the MoodleSite/lang/en_utf8 folder.