Some technical references are listed below that you will hopefully find useful.

 Google Maps: A set of robust API's underline the Google Maps functionality. You may find the following links useful:
         Google Maps API: get started with the Google Maps API.
         Google Maps API Group: Official Google Maps API group where you can pose questions and interact with other API users/developers.
         Google Maps Mania: An unofficial Google Maps blog that tracks a lot of mashups.

 Google Maps Utility Library: contains MarkerManager, a utility to efficiently manage the display of a large number of markers on the map.

 HTML Mime Mail 5: A html mime mail class for use with PHP5.

 openPopUps: A free cross-browser DHTML pop-up generator.

 AnyLink Drop Down Menu: A mouseover or onclick dropdown menu script for href links made available by DynamicDrive.com.

 CSS Shaded Menu Tabs: Neat menu tabs built using CSS made available by DynamicDrive.com.

 Digg-style Pagination: Script for building pagination in the style found at Digg.com

 Some very cool Icon Sets:
         http://www.famfamfam.com/lab/icons/
         http://commons.wikimedia.org/wiki/Crystal_Clear

 Solucija: Great collection of free and commercial website templates.