you can just loop through the features in the drawing layer and look at the lonlat attribute.
something like
lat = (map.getLayerByName("Drawings") as VectorLayer).features[i].lonlat.lat
lon = (map.getLayerByName("Drawings") as VectorLayer).features[i].lonlat.lon
for polygons/ paths you may need to go a bit deeper by looking at the components of a feature instead of just its lonlat, since the lonlat of a polygon is not actually one of its points but a mid-point( i think)
-will