Excellent colleciton of GMaps development libraries
Marker clustering is a neat technique that groups close markers together, replacing them with a bigger circle with count.
This example is from the YCBA collection and uses GMaps, VUFind and MarkerClusterer
The libraries described below create and manage per-zoom-level clusters for large amounts of markers:
Author Luke Mahe. v3 implementation of this base code:
This library allows you to put overlays (images, text or HTML content) on top of a panorama in Street View. They can follow a location (given by lat/lng), and can be connected to a map (so that when you move around the street, the map below it is updated to show the new location).
Advanced time and geo-mapping visualisation by U Leipzig. Animates map points in syncrhonization with timeline selection, allows multiple data sets, shows closest-in-time links, ...
See features and movies. Quite demanding on JS performance.
Eg see this map-time-shot of Volcanos and Tsunamis in Europe I made