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Sure, I should have explained myself better. I meant KWs the site is obviously trying to rank for, ie post titles, part post titles, I'm sure you know the kind of thing I mean.

I still have some...

Now THAT would be a valuable tool, if it existed.

I think the best you can do is find out what keywords a site ranks for using something like scrabebox or xenu. If its ranking for plenty of KWs,...