Chinese-English Dictionary
http://tw.dictionary.yahoo.com/
http://www.zhongwen.com/
Pronunciation
Pinyin System and Zhuyin
http://www.cybertranslator.idv.tw/pinyin/bopomofo.htm
learning Zhuyin symbol(bopomofo) in 90 minutes
input method in Pinyin
http://tools.google.com/pinyin/index.html
Free e-book
http://edu.ocac.gov.tw/ocac_ebook/menu.asp -you can find some Chinese-English books here
speak Chinese in five hundred words -there have different language version
Podcast
http://chinesepod.com/