I have to say, I freaking love this website. The association is called OCAC(Overseas Compatriot Affairs Commission) and it targeted at overseas Taiwanese/Chinese people wishing to improve their Mandarin.
Check out this link here, OCAC Digital Publishing System. It is EXCELLENT. It has soooo many resources for learning Mandarin, and they are all EXTREMELY good.
The main website is http://edu.ocac.gov.tw/home_en.htm.