Witty is a Twitter client for Windows Vista and XP that is powered by the Windows Presentation Foundation (WPF).

Witty includes the following functionalities:

• View recent Twitter statuses from the people you follow (auto-refreshing)
• View recent replies to you
• View a specific user's timeline
• Update your twitter status
• View and respond to Direct Messages
• Links will open in the user's default browser
• Minimize to the System Tray
• Runs in Single Instance mode
• Remembers the window settings for location and size
• Responsive UI with asynchronous cal