If you have a Webkit browser such as Safari or Chrome and Snow Leopard (Apple OS X 10.6) then below you will see a map with two pins that have pulsing rings where the pins meet the map. The only image on this page is the map. Everything else you see was created with just CSS. No JavaScript here either. I don't think the pins turned out that great, but there they are… with shadows nonetheless.
Really all of this was just a fancy way for me to try out my own pure CSS ring pulsers after seeing them on the Transmit 4 launch website this morning. If you like this, check me out at zachstronaut.com