http://www.cambridgeesol.org/teach/ielts/index.cfm

IELTS Teaching Resource

This site, primarily for teachers, features:

• Sample tasks
• Activities to understand the tasks
  
• Tips for teachers and students
  
• DOs and DON'Ts
• Ready-made activities to use with your class
  
• Skills development
  
• Exam practice tasks

The site has a good collection of teaching ideas including a series of useful overview activities (introductory quizzes). The teaching materials usually take the form of mini teaching activities designed to address particular aspects of the different tasks (e.g. Step 1 - Describing Statistics) and are usually not full lesson plans.