You can use Google Analytics hay Google Webmaster Tools to check your traffic.An other way to do this is using SEO Booster WordPress Plugin. There are 2 versions: SEO Booster Lite is free and SEO Booster Pro cost $49.95
SEO Booster Lite detects and analyzes incoming visitors from search engines, and displays the most popular queries in a Widget or via the provided built-in function.
By adding the provided widget in your WordPress blog, it will present site-wide links to these pages with the most popular search term it has detected.
You can download SEO Booster Lite here:
http://wordpress.org/extend/plugins/seo-booster-lite/
Here is capture from my other blog using seo booster lite

And here is capture from Pro version

I use this to check the keyword that bring traffic only




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I am using google anlytics and getclicky tool for this purpose.Here is plugin great I will check how It will works .Thanks for share.
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