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The two non-standard vars used in the AdSense script from this site where google_keywords_url and google_kw_type.
Searching for these with Google, WebmasterWorld shows up as the one and only result. However, that thread is locked.
I now wonder if anyone could help to shed some light on these variables?
google_kw_type is directly linked with google_kw and google_hints, and is attribute to specify keywords, rather than using content targetting.
I'm pretty sure google only gives these functions to premium publishers. I use them myself, but what I do differently is use PHP to randomly select some keywords on each pageload.