Maps API v2 had a built in animation that raised and bounced the marker when it was being dragged. In addition to adding the drag animation offered in v2, Google Geo developers team released two new marker animations that developers can trigger in Maps v3.
“Firstly there’s BOUNCE which simply bounces a marker indefinitely to draw attention to it. The other is DROP which adds a marker to the map by dropping it from above with a small bounce.”
Also,you may notice that the MaxZoom service, is also now available in Maps API v3.
More Info: Documentation