When developing a web application, I’m rather a fan of adding on-screen Post-It style notes, either as a note-to-self, or as a collaboration tool, either to get feedback or to explain what works and what does not. Currently I just add a CSS file and then add a classed div, which pops it to the left or the right side of the screen.
Ticket systems and repository changesets could also be integrated. For example, adding a note with a ‘Raise ticket’ tick could create an item in the user’s ticket system, attached to the on-screen note.
I rather like this idea, so when I get a moment (pencilled currently as the second quarter of 2015) I’ll add some sketches, so I can upgrade the idea from ‘outline’ to ‘doodle’.