Welcome to the Twitter API wiki.  What are you coding?

Twitter API Documentation

• Getting Started
• Frequently asked questions
• API Changelog
• API Blog
• Known Defects and Enhancements List
• Long-term Enhancements

• Support

• Security Best Practices

OAuth

• OAuth FAQ
• OAuth Examples

Mailing Lists/Discussion Groups/IRC

• Twitter Development Talk - detailed discussion, medium/high traffic 
• Twitter API Announce - just critical updates from the Twitter Platform Team, low traffic
• #twitterapi on irc.freenode.net 

Community Resources

• Libraries
• Open source
• Tutorials
• Developers for hire
• Twitter Fan Wiki