This is an experiment in using Drag and Drop with the Canvas tag. A canvas tag is used to display an image. You can then add "markers" to the Image. Markers have associated desc, color, font-size. These values along with the relative position on the image are persisted to a web service through JSONP calls

I wrote this persistence web service from scratch and it works OK. I would probably look at using CouchDB or MongoDB if I spend more time on this

Note: The DB for this little app resets every midnight UTC. Also this is publically editable so if you see anything inapproriate here, please delete/edit it

More info here