Stack Exchange is amazing!

Chinese Language chat
http://chat.stackexchange.com/rooms/12811/chinese-language

TED Talks: How to Learn Chinese with Ease http://www.ted.com/talks/shaolan_learn_to_read_chinese_with_ease.html

Most Commonly Used Characters
http://www.yellowbridge.com/chinese/topchars.php
http://www.popjisyo.com/WebHint/AddHint.aspx?d=9&e=Big5&r=e&s=0&du=http%253a%252f%252fwww.m-w.com%252fcgi-bin%252fdictionary%253fbook%253dDictionary%2526va%253d&u=http%253a%252f%252fresidence.educities.edu.tw%252fwei3128%252fcurrinstruc%252fwordclause%252fgenerwordgrd9.htm http://www.hrexam.com/common.htm
http://wenku.baidu.com/view/7ddd246ab84ae45c3b358cd5.html

HSK
http://en.wikipedia.org/wiki/Hanyu_Shuiping_Kaoshi http://mnks.cnhsk.org/Mnks/Simulate/Default.aspx
http://www.chinesetest.cn/godownload.do