Using leaflet, you can draw on a given map by adding a Canvas layer. Some instructions are given here, http://leaflet.cloudmade.com/reference.html#tilelayer-canvas

var canvasTiles = new L.TileLayer.Canvas();

canvasTiles.drawTile = function(canvas, tilePoint, zoom) {
    var ctx = canvas.getContext('2d');
    // draw something on the tile canvas

However, I'd like to to draw at a specific lat-long location on the map, can that be done?


You should look at defining a custom layer: http://leaflet.cloudmade.com/reference.html#ilayer


So canvas layer might be a bit of overkill to you it might make sense to look at marker or circle marker if you do need to use a canvas layer I believe you have to transform the latlng into the layer coordinates system, and then use the canvas layer functions to map it.

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