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Google Search Dork: ext:txt inurl:dxdiag
This will find text dumps of the DirectX Diag utility. It gives an outline of the hardware of the computer, and goes into quite a bit of detail listing driver versions and such. I can't think of any serious security implacations of this data, but I'll leave it to your imagination.
ext:txt inurl:dxdiag Google Dork Source : ext:txt inurl:dxdiag