Matt Williams's dashboard

As well as keyboard shortcuts, how about using some of Twitter's short hand? So:

To add a something to an agenda item: d {agenda_item_number} {your note}

To link two notes together (needs RV to display an id number for each note): @ {note_id} {your note}

To tag a note: t {tag_name} {your note}

You should be able to enter multiple {agenda_item_number}s and {tag_name}s

This minimises removing your hands off the keyboard, is easy to pick up, and allows people to emulate the relationships they create with lines, circles etc on their written notes