In passing I'll note that, unlike Peter Sean, who's more disturbed by left-wing irrationalism, I'm not sure which brand of anti-science is more pernicious on the whole. I tend, as I think most people do, to get riled up by what gets closest to topics nearest and dearest to me. I do not, however, hold that a view is more, or uniquely, dangerous merely by virtue of its arising from religious conviction. I get the impression listening to some people that they believe, for example, that creationists/intelligent designers are bad news not because they've got their biology all wrong and are confused about the nature and purview of science, and can therefore reasonably be accused of attempting to foist personal religious beliefs on other citizens. Rather, they are wrong and uniquely dangerous merely by virtue of their beliefs and actions being religiously grounded or motivated. (Please note the distinction.) Now, I happen to believe that promoters of ID are disingenuous about their religious agenda, and I see nothing wrong with calling them on it. But an equally insidious secular anti-science agenda would smell just as bad.
Meanwhile I'll also point you to a topically-related post of blogger-to-the-left-of-me (I think) Charles Murtaugh. As an aside, I note that Charles demonstrates an admirable trait - the ability to be passionate in views yet dispassionate in view. In exasperated response to "the Bush administration's ongoing, unprecedented assault on science", he writes: "Once upon a time I would have tried to point out some exculpatory counterarguments on behalf of the Bush administration -- and believe me, there are some pretty feeble entries in the report that Kevin [Drum] cites -- but I'm not really interested in being 'fair and balanced' anymore." Alas for intent, the man can't help himself - even in the throes of honest outrage, his statement rejecting fairness and balance is...pretty damned fair-minded. And his very next post is a report on anti-science from the left. (I'll say the same for Peter Sean. Tsk. Where's purblind partisan hackery when you need it?)