The articles are listed per API.

Google Maps JavaScript API

Migrating Your Google Maps JavaScript Application To v3
Walks you through the process of migrating your application from Google Maps JavaScript API v2 application to a Google Maps JavaScript API application.
Visualizing data: Mapping earthquakes with the Google Maps API
This Google Developer Academy tutorial shows you how to import data, display that data on a map using simple markers and use symbols and heatmaps to improve the appearance and legibility of your map.
Visualizing data: Combining two data sources on a map
This article explains how to take two data sources, one GeoJSON and one pure JSON, and combine them in a basic map visualisation using the data layer.
Describes the basic techniques for geolocation in web applications.
Too Many Markers!
Presents various techniques that can be used to display a large number of locations or markers.
Using PHP/MySQL with Google Maps
Shows how to use PHP/MySQL and the Google Maps JavaScript API to create a map that polls data from a database and shows as markers.
Creating a Store Locator with PHP & MySQL
Shows how to create a store locator where users can search for nearest stores to a geocoded location, and see results as markers on a mobile-optimized map, using PHP/MySQL for the backend.
From Info Windows to a Database: Saving User-Added Form Data
Shows how to prompt users to fill out information in an infowindow, and then save that information back into a database.

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Google Maps APIs
Google Maps APIs