The MyNotes block - a simple yet effective ToDo list from year 2007 for Moodle 1.9

If you ever needed a ToDo list in a block on your Moodle 1.9.x site, look no further than Hugo Santos' MyNotes block. You can use it as a reminder system, a ToDo list, or to manage personal notes for own convenience.

Sounds a bit like the MediaBird Study Notes module. However, this Portugese-made block is less complex, but simpler to install and to use.