This is an old episode of IELTSCast, but the strategies presented in it are still very relevant. In this episode, Igor, an IELTS instructor in Kazakhstan, details how he managed to score band 8.5. The resources Igor suggests are:
The book ‘Listening Strategies for the IELTS’ published by Beijing University Press
The website http://www.renren.com, a Chinese social networking site with well established IELTS communities
Former examiner Chris Green’s work at http://ielts-yasi.englishlab.net/