The playground is a publicly-editable wiki about Arduino.
Manuals and Curriculum
Arduino StackExchange
Board Setup and Configuration
Development Tools
Arduino on other Chips
Interfacing With Hardware
Interfacing with Software
User Code Library
Suggestions & Bugs
Electronics Technique
Sources for Electronic Parts
Related Hardware and Initiatives
Arduino People/Groups & Sites
Exhibition
Project Ideas
Languages
Participate
Shell Page for IRC:What is IRC?How can I get to #arduino?Also head content.