There's a fair amount of rehashing of old stuff in here, but this article from the Brit Independent is a decent summation of the conflicts between the political demands of the U.S. and Britain re: war with Iraq and intelligence agency assessments of its actual threat. Excerpt: Britain and America's spies believe that they are being politicised: that the intelligence they provide is being selectively applied to lead to the opposite conclusion from the one they have drawn, which is that Iraq is much less of a threat than their political masters claim. Worse, when the intelligence agencies fail to do the job, the politicians will not stop at plagiarism to make their case, even "tweaking" the plagiarised material to ensure a better fit.
"You cannot just cherry-pick evidence that suits your case and ignore the rest. It is a cardinal rule of intelligence," said one aggrieved officer. "Yet that is what the PM is doing." Not since Harold Wilson has a Prime Minister been so unpopular with his top spies.
The mounting tension is mirrored in Washington. "We've gone from a zero position, where presidents refused to cite detailed intel as a source, to the point now where partisan material is being officially attributed to these agencies," said one US intelligence source.