Google Maps Icons Reference

Want to use a different icon for your google map? See this link.

Want latitude and longitude from a simple Google Map

itouchmap.com allows you to click and get the lat long of the point selected.

Global Disease Alert Map

http://healthmap.org

Create a map from a published Google Spreadsheet

See this link.

Layer Toggles using Google Maps

LabeledMarker Example: Toggling Marker Groups & Labels

Even better, this one uses KML layers: http://gmaps-samples.googlecode.com/svn/trunk/ggeoxml/ggeoxml_loader2.html