Here's the summary from /.
Of course as a theory it is totally un-sexy and uninspiring, so no doubt the conspiracy nuts will still blame the illuminati, the government, aliens or Elvis.
After all, science is just numbers, and far too boring to dispell the notion of a conspiracy. Especially since most of the people don't understand or even mistrust advanced math, whereas blaming the government can always meet with 'aye's.
Full NIST report can be found here.
NIST WTC 7 Investigation Finds Building Fires Caused Collapse, 08/21/08