Here is list of some useful resources to create twitter applications.

• Twitter API Documentation

HTML

• Update Twitter status from an HTML form

Javascript

• Twitter HTML Badge Code

PHP/AJAX

• Twitter: send message from a PHP page using Twitter API
• Authenticating Twitter API calls with PHP & jQuery
• Sending Authenticated Data to the Twitter API
• Update your Twitter status using your instant messenger
• Proxy for Ajax requests (Twitter API)
• Twitter JavaScript API – The Beginning
• How to create a Twitter widget/client with unobtrusive, degradable JavaScript and FakeJAX
• Google Talk Status to Twitter
• PHP + Twitter + Google Calendar + SMS
• Creating a simple Twitter Reader(Client) in 5 minutes!!

Ruby

• Rails Template: Create a Twitter Application in Seconds
• How to Twitter in Ruby on Rails
• How to Build a Twitter Agent
• 5 Tips for Using the Twitter API With Ruby
• How to Parse Twitter XML in Ruby on Rails
• Be Notified of New Twitter Updates by IM

Java/JSP

• Write your own Twitter application
• Playing with the Twitter API
• Accessing Twitter with Java using HttpClient
• Twitter Access in Java

OTHER

• Twitter JSON/JSONP API URL
• jQuery Twitter API plugin
• Building a Twitter widget, part 1: setting-up the code and displaying a single status
• Building a Twitter widget, part 5: publishing data to your account through authentication
• How To Create A Twitter jQuery Plugin

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