百度关键词搜索量
http://www2.baidu.com/inquire/rsquery.php
google关键词工具
https://adwords.google.com/select/KeywordToolExternal
YAHOO
http://customer.p4p.cn.yahoo.com/keyword/kwwhois.htm
SOHU关键词排序
http://db.sohu.com/regurl/pv_price/query_consumer.asp
网易
http://adpsearch.163.com/find_price.php
OVERTRUE
http://inventory.overture.com/d/searchinventory/suggestion/
http://www2.baidu.com/inquire/rsquery.php
google关键词工具
https://adwords.google.com/select/KeywordToolExternal
YAHOO
http://customer.p4p.cn.yahoo.com/keyword/kwwhois.htm
SOHU关键词排序
http://db.sohu.com/regurl/pv_price/query_consumer.asp
网易
http://adpsearch.163.com/find_price.php
OVERTRUE
http://inventory.overture.com/d/searchinventory/suggestion/
这个好像是给客户用的