Google Maps - How do I make a connections map like this?

[SiobhanyScot]

Looking to do a similar map. Can anyone give me the basics/tips?

http://omalley-supporter-map.heroku.com/

[Airshow]

I've never done it but here is where I would start :
http://code.google.com/apis/maps/documentation/javascript/

More icons here: http://code.google.com/p/google-maps-icons/

Airshow