Thanks :-) It would definitely be good if the map could at some point highlight disruptions, or closed stations/lines, yes (along with other things it could show, such as trains at depots if we know where the depots are). Source is available at http://github.com/dracos/underground-live-map :)
Incidentally there is an official "real time map": http://journeyplanner.tfl.gov.uk/im/RD-T.html It's less cool, but actually tells you at a glance what you really want to know: where disruptions are.