Links

Official

• Twitter API Wiki
• OAuth

Community HowTos

• Automated Serverside Tweeting Using OAuth by @kovshenin
• Writing Your First Twitter Application with OAuth by @snipeyhead

Projects using TwitterOAuth

• phpbb3 Sign in with twitter by @dirtmind
• Twigel by @wuestenigel
• Hawkee by @Hawkee
• Foller.me by @kovshenin