Hm, interesting thought. One thing we have thought a lot about is a reminder function based off of tags — i.e., you set anything tagged #todo to be sent to you every day, but anything tagged as #ideas sent every month. What do you think?
Also, there needs to be some sort of export functionality, that should be the first feature you add!
In terms of chronological order, the notes are displayed in chronological order already. On everything but iPhone and desktop (coming soon) there are timestamps within the note.