One more thing added just now:
Added additional links to main page (to visa advisory pages from VS and DL), and also from the google map marker pop-up to additional info sites - theAirDB, SkyTrax, and google searches for the airport & hotels
theAirDB looks interesting; it shows which airlines serve the airport of interest. This could be useful for planning side trips, or for positioning purposes. Alas it wasn't completely accurate as they don't seem to follow all airlines (e.g. Jet Airways isn't covered at present); maybe this is just a matter of time.