Anatomy of a WordPress Plugin & Widget Tutorials

WordPress is well known for its amazing collection of free plugins. There is one for almost every need
you can think of, from backing up your WordPress installation to asking for a cup of coffee
or fighting spam.
But there are times when none of the available plugins seem to quite do the trick you are looking for. To help you in moments like
that, this tutorial will guide you through every step of building a simple, widgetized WordPress plugin with settings.



Link with source code:
http://net.tutsplus.com/tutorials/wordpress/anatomy-of-a-wordpress-plugin/

Bitly REST API PHP

bitly-api

bitly api REST API -

Google Doc: http://code.google.com/p/bitly-api/wiki/ApiDocumentation

Source script: https://github.com/igorescobar/Bitly-PHP

All Google APIs & Developer Tools In One Plac

Google is providing lots of tools for web designers/developers and almost all of them have their APIs for easier integration with 3rd party services.
If you're a frequent user of these resources and want to reach them easier, Google has a web page specifically for you: Google APIs & Developer Products.

The page lists all development-related resources of Google with their logos and highlights the ones according to their categories.

First source: http://www.webresourcesdepot.com/all-google-apis-developers-in-one-place/
Second source: http://code.google.com/more/table/