Here are a couple of links to the best learning resources that I’ve come across:
Mandarin Chinese with Pimsleur Language Programs, Audio CD (ISBN-10: 0671790331)
Publisher: Simon & Schuster Audio; 2nd Edition, 8 Lessons edition (February 1, 2001)
Note: Get this unabridged from Amazon US. Amazon UK is selling the abridged edition edition from 14 Nov 2009 published by Pimsleur International.