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I'm pretty sure they are just pulling those traffic volume figures directly from google adwords keyword tool.  You can dump your whole list of 500 keywords in that too, and with the right settings you should get the results you are looking for. One thing to be careful with multiple word keywords is the difference between: keyword1 keyword2 [keyword1 keyword2] "keyword1 keyword2" Usually what i am most interested is #2 above.  So what i do is dump the 500 keywords into a text editor, and replace the newlines or commas, or whatever keyword delimiter you have with a [ and then replace it on the other side with a ] if this doesn't make anysense, you can link your list of keywords and i'll do it for you, probably would only take 2 minutes.