Maybe would be useful for some of you. I have used it in the past :
1. http://www.ielts-test.com/ – good reading and some guidance notes
2. http://www.ielts.studyau.com/ – examples for reading componenents and guidance for speed reading
3. http://esl.about.com/cs/quizzesandtests/a/blielts.htm – more free materials
4. http://www.askynz.com/ielts/preparation.htm – preparation tips
5. http://www.britishcouncil.org/professionals-exams-ielts-intro.htm – most comprehensive resource
