I am a mandarin teacher live in Hsinchu , often use the information of the network to teach my students or look for the materials, introduce some very good study mandarin websites, offer to foreign friends who want to learn mandarin well .
csulb.edu/%7Etxie/online.htm
edu.ocac.gov.tw/home.htm
chinese.csie.ncnu.edu.tw/
Hope that everybody studies happily !