Google have today released two new new animations that developers can add to Google Map markers. Firstly there is BOUNCE which simply bounces a marker indefinitely to draw attention to it. You can also create vector file from jpg or use a Free vector map USA, Adobe illustrator. The other is DROP which adds a marker to the map by dropping it from above with a small bounce.
For more details on how to trigger animations check the Google Maps API V3 documentation. If you want to see the animations in action then head over to this example.
Via: Google Geo Developers Blog